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 ]

v. t. [ L. acclamare; ad + clamare to cry out. See Claim, Clamor. ] [ R. ] 1. To applaud. “A glad acclaiming train.” Thomson. [ 1913 Webster ]

2. To declare by acclamations. [ 1913 Webster ]

While the shouting crowd
Acclaims thee king of traitors. Smollett. [ 1913 Webster ]

3. To shout; as, to acclaim my joy. [ 1913 Webster ]

v. i. To shout applause. [ 1913 Webster ]

n. Acclamation. [ Poetic ] Milton. [ 1913 Webster ]

n. One who acclaims. [ 1913 Webster ]

n. [ L. acclamatio: cf. F. acclamation. ] 1. A shout of approbation, favor, or assent; eager expression of approval; loud applause. [ 1913 Webster ]

On such a day, a holiday having been voted by acclamation, an ordinary walk would not satisfy the children. Southey. [ 1913 Webster ]

2. (Antiq.) A representation, in sculpture or on medals, of people expressing joy. [ 1913 Webster ]

3. In parliamentary usage, the act or method of voting orally and by groups rather than by ballot, esp. in elections; specif. (R. C. Ch.), the election of a pope or other ecclesiastic by unanimous consent of the electors, without a ballot. [ Webster 1913 Suppl. ]

Acclamation medals are those on which laudatory acclamations are recorded. Elmes. [ 1913 Webster ]

a. Pertaining to, or expressing approval by, acclamation. [ 1913 Webster ]

a. Capable of being acclimated. [ 1913 Webster ]

n. [ Cf. F. acclimation. See Acclimate. ] Acclimatization. [ 1913 Webster ]

v. t. [ imp. & p. p. Acclimated p. pr. & vb. n. Acclimating. ] [ F. acclimater; à (l. ad) + climat climate. See Climate. ] To habituate to a climate not native; to acclimatize. J. H. Newman. [ 1913 Webster ]

n. Acclimation. [ R. ] [ 1913 Webster ]

n. The process of becoming, or the state of being, acclimated, or habituated to a new climate; acclimatization. [ 1913 Webster ]

a. Capable of being acclimatized. [ 1913 Webster ]

n. The act of acclimatizing; the process of inuring to a new climate, or the state of being so inured. Darwin. [ 1913 Webster ]

v. t. [ imp. & p. p. Acclimatized p. pr. & vb. n. Acclimatizing ] To inure or habituate to a climate different from that which is natural; to adapt to the peculiarities of a foreign or strange climate; said of man, the inferior animals, or plants. [ 1913 Webster ]

n. The act of acclimating, or the state of being acclimated. [ R. ] Caldwell. [ 1913 Webster ]

a. Acclivous. [ Obs. ] [ 1913 Webster ]

a. Acclivous. I. Taylor. [ 1913 Webster ]

n.; pl. Acclivities [ L. acclivitas, fr. acclivis, acclivus, ascending; ad + clivus a hill, slope, fr. root kli to lean. See Lean. ] A slope or inclination of the earth, as the side of a hill, considered as ascending, in opposition to declivity, or descending; an upward slope; ascent. [ 1913 Webster ]

a. [ L. acclivis and acclivus. ] Sloping upward; rising as a hillside; -- opposed to declivous. [ 1913 Webster ]

v. t. [ OF. encloyer, encloer, F. enclouer, to drive in a nail, fr. L. in + clavus nail. ] To fill to satiety; to stuff full; to clog; to overload; to burden. See Cloy. [ Obs. ] Chaucer. [ 1913 Webster ]

a. [ Gr. 'a priv. + kli`nein to incline. ] (Physics.) Without inclination or dipping; -- said of the imaginary line near the earth's equator on which the magnetic needle balances itself horizontally, having no dip. The aclinic line is also termed the magnetic equator. Prof. August. [ 1913 Webster ]

n. 1. 1 a genus of herbs and shrubs of Australia and Southern Africa, with an everlasting flower; most species are usually placed in genus Helipterum.
Syn. -- genus Acroclinium [ WordNet 1.5 ]

a. [ Pref. a- not + cyclic. ] Not cyclic; not disposed in cycles or whorls; as: (a) (Bot.) Of a flower, having its parts inserted spirally on the receptacle. (b) (Org. Chem.) Having an open-chain structure; aliphatic. [ Webster 1913 Suppl. ]

‖n. [ NL.; adeno- + sclerosis. ] (Med.) The hardening of a gland. AS [ Webster 1913 Suppl. ]

n. [ L. adminculum support, orig., that on which the hand rests; ad + manus hand + dim. ending -culym. ] 1. Help or support; an auxiliary. Grote. [ 1913 Webster ]

2. (Law) Corroborative or explanatory proof. [ 1913 Webster ]

In Scots law, any writing tending to establish the existence or terms of a lost deed. Bell. [ 1913 Webster ]

n. [ Aëro- + club. ] A club or association of persons interested in aëronautics. [ Webster 1913 Suppl. ]

n. An unexpected subsequent event; something disagreeable happening after an affair is supposed to be at an end. Spenser. [ 1913 Webster ]

a. (Org. Chem.) pertaining to compounds that have a ring in the structure, but are not aromatic, as cyclohexane or cyclohexene. Compare aliphatic and aromatic. [ PJC. ]

adj. 1. broad in scope or content.
Syn. -- all-embracing, across-the-board, blanket(prenominal), broad, complete, global, panoptic, wide. [ WordNet 1.5 ]

. (Physics & Chem.) a particle emitted at high velocity from certain radioactive substances. It is identical to the helium nucleus, consisting of two protons and two neutrons. Rays of such particles are called alpha rays. [ Webster 1913 Suppl. +PJC ]

a. [ Gr. &unr_; to bend back and break; to reflect (light); &unr_; + &unr_; to break. ] 1. (Opt.) Produced by the refraction of light, as seen through water; as, anaclastic curves. [ 1913 Webster ]

2. Springing back, as the bottom of an anaclastic glass. [ 1913 Webster ]

Anaclastic glass, a glass or phial, shaped like an inverted funnel, and with a very thin convex bottom. By sucking out a little air, the bottom springs into a concave form with a smart crack; and by breathing or blowing gently into the orifice, the bottom, with a like noise, springs into its former convex form. [ 1913 Webster ]

n. (Opt.) That part of optics which treats of the refraction of light; -- commonly called dioptrics. Encyc. Brit. [ 1913 Webster ]

n. See Ankle. [ 1913 Webster ]

n. [ L. angustus narrow + clavus a nail, a stripe. ] (Rom. Antiq.) A narrow stripe of purple worn by the equites on each side of the tunic as a sign of rank. [ Webster 1913 Suppl. ]

n. [ Gr. 'an priv. + orthoclase. ] (Min.) A feldspar closely related to orthoclase, but triclinic. It is chiefly a silicate of sodium, potassium, and aluminium. Sp. gr., 2.57 -- 2.60. [ Webster 1913 Suppl. ]

‖n. [ Gr. &unr_;; 'anti`/ + 'ana`klasis a bending back and breaking. See Anaclastic. ] (Rhet.) (a) A figure which consists in repeating the same word in a different sense; as, Learn some craft when young, that when old you may live without craft. (b) A repetition of words beginning a sentence, after a long parenthesis; as, Shall that heart (which not only feels them, but which has all motions of life placed in them), shall that heart, etc. [ 1913 Webster ]

a. [ Pref. anti- = Gr. kla^n to break. ] Having opposite curvatures, that is, curved longitudinally in one direction and transversely in the opposite direction, as the surface of a saddle. [ 1913 Webster ]

n. (Rhet.) A sentence in which the ideas fall, or become less important and striking, at the close; -- the opposite of climax. It produces a ridiculous effect. Example: Next comes Dalhousie, the great god of war,
Lieutenant-colonel to the Earl of Mar. [ 1913 Webster ]

n. (Geol.) The crest or line in which strata slope or dip in opposite directions. [ 1913 Webster ]

a. [ Pref. anti- + Gr. kli`nein to incline. ] 1. Inclining or dipping in opposite directions. See Synclinal. [ 1913 Webster ]

2. (Bot.) occurring at right angles to the surface of a plant organ. [ PJC ]

Anticlinal line,
Anticlinal axis (Geol.), a line from which strata dip in opposite directions, as from the ridge of a roof. --
Anticlinal vertebra (Anat.), one of the dorsal vertebræ, which in many animals has an upright spine toward which the spines of the neighboring vertebræ are inclined. [ 1913 Webster ]

n. [ See Anticlinal. ] (Geol.) A structure of bedded rocks in which the beds on both sides of an axis or axial plane dip away from the axis; an anticlinal. Contrassted with syncline. [ Webster 1913 Suppl. ]

‖n.; pl. Anticlinoria [ NL., fr. Gr. 'anti` against + kli`nein to incline + 'o`ros mountain. ] (Geol.) The upward elevation of the crust of the earth, resulting from a geanticlinal. [ 1913 Webster ]

adv. Oddly; grotesquely. [ 1913 Webster ]

n. (Meteorol.) A movement of the atmosphere opposite in character, as regards direction of the wind and distribution of barometric pressure, to that of a cyclone. -- An`ti*cy*clon"ic a. -- An`ti*cy*clon"ic*al*ly adv. [ 1913 Webster ]

adj. 1. of or pertaining to an anticyclone; moving in the opposite direction of a cyclone. [ WordNet 1.5 ]

n. (Physics) A fundamental particle which has the same mass as one of the common fundamental particles, but which has an opposite charge, and for which certain other of the properties (e. g. baryon number, strangeness) may be opposite to that of the normal particle. The antiparticle to an electron is called a positron; the antiparticle to a proton is called an antiproton; the antiparticle to a neutron is called an antineutron. When a particle and its corresponding antiparticle collide, they typically annihilate each other with the production of large quantities of energy, usually in the form of radiation. The interaction of a proton and antiproton cause annihilation with production of mesons. [ PJC ]

n. [ L. appendicula, dim. of. appendix. ] A small appendage. [ 1913 Webster ]

n. [ L. arbuscula small tree, shrub, dim. of arbor tree. ] A dwarf tree, one in size between a shrub and a tree; a treelike shrub. Bradley. [ 1913 Webster ]

adj. 1. 1 protected with a covering of armor.
Syn. -- steel-plated. [ WordNet 1.5 ]