n. An insoluble solid alcohol (C12H25OH) with an unbranched paraffin chain, used to make detergents, such as sodium lauryl sulfate.
Syn. -- lauryl alcohol [ WordNet 1.5 +PJC ]

n. 1. a class mail comprising letters, postcards, and other mail sealed against inspection, having a higher priority than second, third, or fourth-class mail; -- it is the highest class of mail not handled in a special manner, as is registered or priority mail.
Syn. -- first-class, first-class mail, 1st-class mail [ WordNet 1.5 ]

The first letter of the English and of many other alphabets. The capital A of the alphabets of Middle and Western Europe, as also the small letter (a), besides the forms in Italic, black letter, etc., are all descended from the old Latin A, which was borrowed from the Greek Alpha, of the same form; and this was made from the first letter (&unr_;) of the Phœnician alphabet, the equivalent of the Hebrew Aleph, and itself from the Egyptian origin. The Aleph was a consonant letter, with a guttural breath sound that was not an element of Greek articulation; and the Greeks took it to represent their vowel Alpha with the ä sound, the Phœnician alphabet having no vowel symbols. [ 1913 Webster ]

This letter, in English, is used for several different vowel sounds. See Guide to pronunciation, §§ 43-74. The regular long a, as in fate, etc., is a comparatively modern sound, and has taken the place of what, till about the early part of the 17th century, was a sound of the quality of ä (as in far). [ 1913 Webster ]

2. (Mus.) The name of the sixth tone in the model major scale (that in C), or the first tone of the minor scale, which is named after it the scale in A minor. The second string of the violin is tuned to the A in the treble staff. -- A sharp (A♯) is the name of a musical tone intermediate between A and B. -- A flat (A♭) is the name of a tone intermediate between A and G. [ 1913 Webster ]

A per se (L. per se by itself), one preëminent; a nonesuch. [ Obs. ] [ 1913 Webster ]

O fair Creseide, the flower and A per se
Of Troy and Greece. Chaucer. [ 1913 Webster ]

1. [ Shortened form of an. AS. ān one. See One. ] An adjective, commonly called the indefinite article, and signifying one or any, but less emphatically. “At a birth”; “In a word”; “At a blow”. Shak. It is placed before nouns of the singular number denoting an individual object, or a quality individualized, before collective nouns, and also before plural nouns when the adjective few or the phrase great many or good many is interposed; as, a dog, a house, a man; a color; a sweetness; a hundred, a fleet, a regiment; a few persons, a great many days. It is used for an, for the sake of euphony, before words beginning with a consonant sound [ for exception of certain words beginning with h, see An ]; as, a table, a woman, a year, a unit, a eulogy, a ewe, a oneness, such a one, etc. Formally an was used both before vowels and consonants. [ 1913 Webster ]

2. [ Originally the preposition a (an, on). ] In each; to or for each; as, “twenty leagues a day”, “a hundred pounds a year”, “a dollar a yard”, etc. [ 1913 Webster ]

prep. [ Abbreviated form of an (AS. on). See On. ] 1. In; on; at; by. [ Obs. ] “A God's name.” “Torn a pieces.” “Stand a tiptoe.” “A Sundays” Shak. “Wit that men have now a days.” Chaucer. “Set them a work.” Robynson (More's Utopia). [ 1913 Webster ]

2. In process of; in the act of; into; to; -- used with verbal substantives in -ing which begin with a consonant. This is a shortened form of the preposition an (which was used before the vowel sound); as in a hunting, a building, a begging. “Jacob, when he was a dying” Heb. xi. 21. “We'll a birding together.” “ It was a doing.” Shak. “He burst out a laughing.” Macaulay. The hyphen may be used to connect a with the verbal substantive (as, a-hunting, a-building) or the words may be written separately. This form of expression is now for the most part obsolete, the a being omitted and the verbal substantive treated as a participle. [ 1913 Webster ]

. [ From AS. of off, from. See Of. ] Of. [ Obs. ] “The name of John a Gaunt.” “What time a day is it ?” Shak. “It's six a clock.” B. Jonson. [ 1913 Webster ]

. A barbarous corruption of have, of he, and sometimes of it and of they. “So would I a done” “A brushes his hat.” Shak. [ 1913 Webster ]

. An expletive, void of sense, to fill up the meter [ 1913 Webster ]

A merry heart goes all the day,
Your sad tires in a mile-a. Shak. [ 1913 Webster ]

. A, as a prefix to English words, is derived from various sources. (1) It frequently signifies on or in (from an, a forms of AS. on), denoting a state, as in afoot, on foot, abed, amiss, asleep, aground, aloft, away (AS. onweg), and analogically, ablaze, atremble, etc. (2) AS. of off, from, as in adown (AS. ofdūne off the dun or hill). (3) AS. ā- (Goth. us-, ur-, Ger. er-), usually giving an intensive force, and sometimes the sense of away, on, back, as in arise, abide, ago. (4) Old English y- or i- (corrupted from the AS. inseparable particle ge-, cognate with OHG. ga-, gi-, Goth. ga-), which, as a prefix, made no essential addition to the meaning, as in aware. (5) French à (L. ad to), as in abase, achieve. (6) L. a, ab, abs, from, as in avert. (7) Greek insep. prefix α without, or privative, not, as in abyss, atheist; akin to E. un-. [ 1913 Webster ]

Besides these, there are other sources from which the prefix a takes its origin. [ 1913 Webster ]

A registry mark given by underwriters (as at Lloyd's) to ships in first-class condition. Inferior grades are indicated by A 2 and A 3. [ 1913 Webster ]

A 1 is also applied colloquially to other things to imply superiority; prime; first-class; first-rate. [ 1913 Webster ]

n. 1. acronym for Associate in Arts, a college degree granted for successful completion of a two-year course of study in arts or general topics.
Syn. -- Associate in Arts [ WordNet 1.5 ]

2. Alcoholics Anonymous. [ Acronym. ] [ WordNet 1.5 ]

n. 1. the American Association for the Advancement of Science, an organization with headquarters in Washington, D.C. Its goal is to advance the physical and social sciences, and it publishes a weekly journal Science, with original research articles as well as reviews and commentary. [ Acronym. ]
Syn. -- American Association for the Advancement of Science. [ WordNet 1.5 ]

‖n. [ D. aam, fr. LL. ama; cf. L. hama a water bucket, Gr. &unr_; ] A Dutch and German measure of liquids, varying in different cities, being at Amsterdam about 41 wine gallons, at Antwerp 361/2, at Hamburg 381/4. [ Written also Aum and Awm. ] [ 1913 Webster ]

‖n. [ D., earth-pig. ] (Zool.) An edentate mammal, of the genus Orycteropus (Orycteropus afer), somewhat resembling a pig, common in some parts of Southern Africa. It is a nocturnal ungulate, burrows in the ground with its powerful claws, and feeds entirely on ants and termites, which it catches with its long, extensile, slimy tongue. It is the sole extant representative of the order Tubulidentata. [ Spelled also Aard-vark. ]
Syn. --ant bear, anteater, Orycteropus afer, oryctere, orycterope [ 1913 Webster WordNet 1.5 ]

‖n. [ D, earth-wolf ] (Zool.) A carnivorous, striped, quadruped mammal (Proteles cristata, formerly Proteles Lalandii), of South Africa, resembling the fox and hyena. It feeds chiefly on insects. See Proteles. [ 1913 Webster WordNet 1.5 ]

{ } a. Pertaining to Aaron, the first high priest of the Jews. [ 1913 Webster ]

[ See Exodus vii. 9 and Numbers xvii. 8 ] 1. (Arch.) A rod with one serpent twined around it, thus differing from the caduceus of Mercury, which has two. [ 1913 Webster ]

2. (Bot.) A plant with a tall flowering stem; esp. the great mullein, or hag-taper, and the golden-rod. [ 1913 Webster ]

n. 1. an associate degree conferred for successful studies in applied science. [ WordNet 1.5 ]

n. 1. a loose sleeveless outer garment made from aba cloth; worn by Arabs. overgarment, outer garment [ WordNet 1.5 ]

‖n. [ Of Syriac origin. ] The fifth month of the Jewish year according to the ecclesiastical reckoning, the eleventh by the civil computation, coinciding nearly with August. W. Smith. [ 1913 Webster ]

[ Latin prep., etymologically the same as E. of, off. See Of. ] A prefix in many words of Latin origin. It signifies from, away , separating, or departure, as in abduct, abstract, abscond. See A-(6). [ 1913 Webster ]

‖n. [ The native name. ] The Manila-hemp plant (Musa textilis); also, its fiber. See Manila hemp under Manila. [ 1913 Webster ]

v. t. [ LL. abacinatus, p. p. of abacinare; ab off + bacinus a basin. ] To blind by a red-hot metal plate held before the eyes. [ R. ] [ 1913 Webster ]

n. The act of abacinating. [ R. ] [ 1913 Webster ]

‖n. [ Gr. 'abaki`skos, dim of 'a`bax. See Abacus. ] (Arch.) One of the tiles or squares of a tessellated pavement; an abaculus. [ 1913 Webster ]

n. [ LL abacista, fr. abacus. ] One who uses an abacus in casting accounts; a calculator. [ 1913 Webster ]

adv. [ Pref. a- + back; AS. on bæc at, on, or toward the back. See Back. ] 1. Toward the back or rear; backward. “Therewith aback she started.” Chaucer. [ 1913 Webster ]

2. Behind; in the rear. Knolles. [ 1913 Webster ]

3. (Naut.) Backward against the mast; -- said of the sails when pressed by the wind. Totten. [ 1913 Webster ]

To be taken aback. (a) To be driven backward against the mast; -- said of the sails, also of the ship when the sails are thus driven. (b) To be suddenly checked, baffled, or discomfited. Dickens. [ 1913 Webster ]

n. An abacus. [ Obs. ] B. Jonson. [ 1913 Webster ]

a. [ L. ab + E. actinal. ] (Zool.) Pertaining to the surface or end opposite to the mouth in a radiate animal; -- opposed to actinal. “The aboral or abactinal area.” L. Agassiz. [ 1913 Webster ]

n. Stealing cattle on a large scale. [ Obs. ] [ 1913 Webster ]

n. [ L., fr. abigere to drive away; ab + agere to drive. ] (Law) One who steals and drives away cattle or beasts by herds or droves. [ Obs. ] [ 1913 Webster ]

‖n.; pl. Abaculi [ L., dim. of abacus. ] (Arch.) A small tile of glass, marble, or other substance, of various colors, used in making ornamental patterns in mosaic pavements. Fairholt. [ 1913 Webster ]

n.; E. pl. Abacuses ; L. pl. Abaci [ L. abacus, abax, Gr. 'a`bax ] 1. A table or tray strewn with sand, anciently used for drawing, calculating, etc. [ Obs. ] [ 1913 Webster ]

2. A calculating table or frame; an instrument for performing arithmetical calculations by balls sliding on wires, or counters in grooves, the lowest line representing units, the second line, tens, etc. It is still employed in China. [ 1913 Webster ]

3. (Arch.) (a) The uppermost member or division of the capital of a column, immediately under the architrave. See Column. (b) A tablet, panel, or compartment in ornamented or mosaic work. [ 1913 Webster ]

4. A board, tray, or table, divided into perforated compartments, for holding cups, bottles, or the like; a kind of cupboard, buffet, or sideboard. [ 1913 Webster ]

Abacus harmonicus (Mus.), an ancient diagram showing the structure and disposition of the keys of an instrument. Crabb. [ 1913 Webster ]

n. [ Pg., the female rhinoceros. ] The rhinoceros. [ Obs. ] Purchas. [ 1913 Webster ]

n. [ Heb. ābaddōn destruction, abyss, fr. ābad to be lost, to perish. ] 1. The destroyer, or angel of the bottomless pit; -- the same as Apollyon and Asmodeus. [ 1913 Webster ]

2. Hell; the bottomless pit. [ Poetic ] [ 1913 Webster ]

In all her gates, Abaddon rues
Thy bold attempt. Milton. [ 1913 Webster ]

prep. [ Pref. a- on + OE. baft, baften, biaften, AS. beæftan; be by + æftan behind. See After, Aft, By. ] (Naut.) Behind; toward the stern from; as, abaft the wheelhouse. [ 1913 Webster ]

Abaft the beam. See under Beam. [ 1913 Webster ]

adv. (Naut.) Toward the stern; aft; as, to go abaft. [ 1913 Webster ]

n. [ For obeisance; confused with F. abaisser, E. abase. ] Obeisance. [ Obs. ] Jonson. [ 1913 Webster ]

n. Ivory black or animal charcoal. Weale. [ 1913 Webster ]

p. p. Abashed; confounded; discomfited. [ Obs. ] Chaucer. [ 1913 Webster ]

v. t. [ L. abalienatus, p. p. of abalienare; ab + alienus foreign, alien. See Alien. ] 1. (Civil Law) To transfer the title of from one to another; to alienate. [ 1913 Webster ]

2. To estrange; to withdraw. [ Obs. ] [ 1913 Webster ]

3. To cause alienation of (mind). Sandys. [ 1913 Webster ]

n. [ L. abalienatio: cf. F. abaliénation. ] The act of abalienating; alienation; estrangement. [ Obs. ] [ 1913 Webster ]

‖n. (Zool.) A univalve mollusk of the genus Haliotis. The shell is lined with mother-of-pearl, and used for ornamental purposes; the sea-ear. Several large species are found on the coast of California, clinging closely to the rocks. [ 1913 Webster ]

n. 1. 1 (Electricity) a unit of electrical current equal to 10 amperes.
Syn. -- abamp [ WordNet 1.5 ]

v. t. [ Contracted from abandon. ] 1. To abandon. [ Obs. ] [ 1913 Webster ]

Enforced the kingdom to aband. Spenser. [ 1913 Webster ]

2. To banish; to expel. [ Obs. ] Mir. for Mag. [ 1913 Webster ]

v. t. [ imp. & p. p. Abandoned p. pr. & vb. n. Abandoning. ] [ OF. abandoner, F. abandonner; a (L. ad) + bandon permission, authority, LL. bandum, bannum, public proclamation, interdiction, bannire to proclaim, summon: of Germanic origin; cf. Goth. bandwjan to show by signs, to designate OHG. ban proclamation. The word meant to proclaim, put under a ban, put under control; hence, as in OE., to compel, subject, or to leave in the control of another, and hence, to give up. See Ban. ] 1. To cast or drive out; to banish; to expel; to reject. [ Obs. ] [ 1913 Webster ]

That he might . . . abandon them from him. Udall. [ 1913 Webster ]

Being all this time abandoned from your bed. Shak. [ 1913 Webster ]

2. To give up absolutely; to forsake entirely ; to renounce utterly; to relinquish all connection with or concern on; to desert, as a person to whom one owes allegiance or fidelity; to quit; to surrender. [ 1913 Webster ]

Hope was overthrown, yet could not be abandoned. I. Taylor. [ 1913 Webster ]

3. Reflexively: To give (one's self) up without attempt at self-control; to yield (one's self) unrestrainedly; -- often in a bad sense. [ 1913 Webster ]

He abandoned himself . . . to his favorite vice. Macaulay. [ 1913 Webster ]

4. (Mar. Law) To relinquish all claim to; -- used when an insured person gives up to underwriters all claim to the property covered by a policy, which may remain after loss or damage by a peril insured against. [ 1913 Webster ]

Syn. -- To give up; yield; forego; cede; surrender; resign; abdicate; quit; relinquish; renounce; desert; forsake; leave; retire; withdraw from. -- To Abandon, Desert, Forsake. These words agree in representing a person as giving up or leaving some object, but differ as to the mode of doing it. The distinctive sense of abandon is that of giving up a thing absolutely and finally; as, to abandon one's friends, places, opinions, good or evil habits, a hopeless enterprise, a shipwrecked vessel. Abandon is more widely applicable than forsake or desert. The Latin original of desert appears to have been originally applied to the case of deserters from military service. Hence, the verb, when used of persons in the active voice, has usually or always a bad sense, implying some breach of fidelity, honor, etc., the leaving of something which the person should rightfully stand by and support; as, to desert one's colors, to desert one's post, to desert one's principles or duty. When used in the passive, the sense is not necessarily bad; as, the fields were deserted, a deserted village, deserted halls. Forsake implies the breaking off of previous habit, association, personal connection, or that the thing left had been familiar or frequented; as, to forsake old friends, to forsake the paths of rectitude, the blood forsook his cheeks. It may be used either in a good or in a bad sense. [ 1913 Webster ]

n. [ F. abandon. fr. abandonner. See Abandon, v. ] Abandonment; relinquishment. [ Obs. ] [ 1913 Webster ]

‖n. [ F. See Abandon. ] A complete giving up to natural impulses; freedom from artificial constraint; careless freedom or ease. [ 1913 Webster ]

a. 1. Forsaken, deserted. “Your abandoned streams.” Thomson. [ 1913 Webster ]

2. Self-abandoned, or given up to vice; extremely wicked, or sinning without restraint; irreclaimably wicked ; as, an abandoned villain. [ 1913 Webster ]

Syn. -- Profligate; dissolute; corrupt; vicious; depraved; reprobate; wicked; unprincipled; graceless; vile. -- Abandoned, Profligate, Reprobate. These adjectives agree in expressing the idea of great personal depravity. Profligate has reference to open and shameless immoralities, either in private life or political conduct; as, a profligate court, a profligate ministry. Abandoned is stronger, and has reference to the searing of conscience and hardening of heart produced by a man's giving himself wholly up to iniquity; as, a man of abandoned character. Reprobate describes the condition of one who has become insensible to reproof, and who is morally abandoned and lost beyond hope of recovery. [ 1913 Webster ]

God gave them over to a reprobate mind. Rom. i. 28. [ 1913 Webster ]

adv. Unrestrainedly. [ 1913 Webster ]