n. [ L. compressio: cf. F. compression. ] 1. The act of compressing, or state of being compressed. “Compression of thought.” Johnson. [ 1913 Webster ]

2. (Computers) reduction of the space required for storage (of binary data) by an algorithm which converts the data to a smaller number of bits while preserving the information content. The act of compressing { 3 }. Compression may be lossless compression, in which all of the information in the original data is preserved, and the original data may be recovered in form identical to its original form; or lossy compression, in which some of the information in the original data is lost, and decompression results in a data form slightly different from the original. Lossy compression is used, for example, to compress audio or video recordings, and sometimes images, where the slight differences in the original data and the data recovered after lossy compression may be imperceptable to the human eye or ear. The JPEG format is produced by a lossy compression algorithm. [ PJC ]

. A projectile constructed so as to take the grooves of a rifle by means of a soft copper band firmly attached near its base or, formerly, by means of an envelope of soft metal. In small arms the modern projectile, having a soft core and harder jacket, is subjected to compression throughout the entire cylindrical part. [ Webster 1913 Suppl. ]

n. 1. the process of experiencing decompression; the act or process of relieving or reducing pressure.
Syn. -- decompressing. [ WordNet 1.5 +PJC ]

2. the reduction of atmospheric pressure experienced by divers rising from deep water to the surface, thus reducing the concentration of dissolved atmospheric gases in the blood; -- especially applied to a gradual reduction of such pressure. [ PJC ]

3. the process, analogous to sense 2, undergone by divers in a decompression chamber, in which an artificially high atmospheric pressure is gradually lowered to normal pressure. [ PJC ]

4. a return to a normal, more relaxed state after a period of intense stress, psychological pressure, or urgent activity; -- of people. [ PJC ]

5. (Computers) the process of converting digitally encoded data from a more compact (compressed) form to its original, larger size. The process of compression and decompression may completely recover all of the original data (called lossless compression), or may lose some of the original data in order to achieve higher degress of compression (lossy compression). The latter is used especially with images or video data, which may be of very large size relative to text, and for which small changes may be imperceptible to the human eye. The JPEG data compression format is a lossy format. [ PJC ]

n. [ L. depressio: cf. F. dépression. ] 1. The act of depressing. [ 1913 Webster ]

2. The state of being depressed; a sinking. [ 1913 Webster ]

3. A falling in of the surface; a sinking below its true place; a cavity or hollow; as, roughness consists in little protuberances and depressions. [ 1913 Webster ]

4. Humiliation; abasement, as of pride. [ 1913 Webster ]

5. Dejection; despondency; lowness. [ 1913 Webster ]

In a great depression of spirit. Baker. [ 1913 Webster ]

6. Diminution, as of trade, etc.; inactivity; dullness. [ 1913 Webster ]

7. (Astron.) The angular distance of a celestial object below the horizon. [ 1913 Webster ]

8. (Math.) The operation of reducing to a lower degree; -- said of equations. [ 1913 Webster ]

9. (Surg.) A method of operating for cataract; couching. See Couch, v. t., 8. [ 1913 Webster ]

Angle of depression (Geod.), one which a descending line makes with a horizontal plane. --
Depression of the dewpoint (Meteor.), the number of degrees that the dew-point is lower than the actual temperature of the atmosphere. --
Depression of the pole, its apparent sinking, as the spectator goes toward the equator. --
Depression of the visible horizon. (Astron.) Same as Dip of the horizon, under Dip.

Syn. -- Abasement; reduction; sinking; fall; humiliation; dejection; melancholy. [ 1913 Webster ]

n. [ L. expressio: cf. F. expression. ] 1. The act of expressing; the act of forcing out by pressure; as, the expression of juices or oils; also, of extorting or eliciting; as, a forcible expression of truth. [ 1913 Webster ]

2. The act of declaring or signifying; declaration; utterance; as, an expression of the public will. [ 1913 Webster ]

With this tone of philosophy were mingled expressions of sympathy. Prescott. [ 1913 Webster ]

3. Lively or vivid representation of meaning, sentiment, or feeling, etc.; significant and impressive indication, whether by language, appearance, or gesture; that manner or style which gives life and suggestive force to ideas and sentiments; as, he reads with expression; her performance on the piano has expression. [ 1913 Webster ]

The imitators of Shakespeare, fixing their attention on his wonderful power of expression, have directed their imitation to this. M. Arnold. [ 1913 Webster ]

4. That which is expressed by a countenance, a posture, a work of art, etc.; look, as indicative of thought or feeling. “The expression of an eye.” Tennyson. [ 1913 Webster ]

It still wore the majesty of expression so conspicuous in his portraits by the inimitable pencil of Titian. Prescott. [ 1913 Webster ]

5. A form of words in which an idea or sentiment is conveyed; a mode of speech; a phrase; as, a common expression; an odd expression. [ 1913 Webster ]

6. (Math.) The representation of any quantity or relation by appropriate characters or symbols, usually in a specific order. [ 1913 Webster +PJC ]

7. (Genetics) the production of products by a gene that cause the appearance of the corresponding protein or phenotype; -- of a gene or of an organism with a specific gene; as, the expression the beta-galactosidase positive phenotype, [ PJC ]

8. (Computers) a combination of characters linked by operators, occurring as part of the code of a computer program, which must be evaluated according to the rules of the computer language in order to produce a resulting value. [ PJC ]

In most programming languages, (a + b) is an expression indicating simple arithmetic addition, if the variables a and b are real numbers. Many other types of operation may be used in programs, and each set of symbols indicating an operation is an expression in that program. [ PJC ]

Past expression,
Beyond expression, beyond the power of description. “Beyond expression bright.” Milton. [ 1913 Webster ]

a. Of, or relating to, expression; phraseological; also, vividly representing or suggesting an idea or sentiment. Fitzed. Hall. Ruskin. [ 1913 Webster ]

n. 1. an art movement early in the 20th century; the artist's subjective expression of inner experiences was emphasized. [ WordNet 1.5 ]

2. a genre of German painting that tried to show the subjective responses to scenes rather than the scenes themselves. [ WordNet 1.5 ]

n. an artist who is an adherent of expressionism. [ WordNet 1.5 ]

adj. 1. of or pertaining to expressionism (definition 2); as, expressionist art. [ WordNet 1.5 ]

a. Destitute of expression. [ 1913 Webster ]

n. [ F. impression, L. impressio. ] 1. The act of impressing, or the state of being impressed; the communication of a stamp, mold, style, or character, by external force or by influence. [ 1913 Webster ]

2. That which is impressed; stamp; mark; indentation; sensible result of an influence exerted from without. [ 1913 Webster ]

The stamp and clear impression of good sense. Cowper. [ 1913 Webster ]

To shelter us from impressions of weather, we must spin, we must weave, we must build. Barrow. [ 1913 Webster ]

3. That which impresses, or exercises an effect, action, or agency; appearance; phenomenon. [ Obs. ] [ 1913 Webster ]

Portentous blaze of comets and impressions in the air. Milton. [ 1913 Webster ]

A fiery impression falling from out of Heaven. Holland. [ 1913 Webster ]

4. Influence or effect on the senses or the intellect hence, interest, concern. Reid. [ 1913 Webster ]

His words impression left. Milton. [ 1913 Webster ]

Such terrible impression made the dream. Shak. [ 1913 Webster ]

I have a father's dear impression,
And wish, before I fall into my grave,
That I might see her married. Ford. [ 1913 Webster ]

5. An indistinct notion, remembrance, or belief. [ 1913 Webster ]

6. Impressiveness; emphasis of delivery. [ 1913 Webster ]

Which must be read with an impression. Milton. [ 1913 Webster ]

7. (Print.) The pressure of the type on the paper, or the result of such pressure, as regards its appearance; as, a heavy impression; a clear, or a poor, impression; also, a single copy as the result of printing, or the whole edition printed at a given time; as, a copy from the fifth impression. [ 1913 Webster ]

Ten impressions which his books have had. Dryden. [ 1913 Webster ]

8. In painting, the first coat of color, as the priming in house painting and the like. [ R. ] [ 1913 Webster ]

9. (Engraving) A print on paper from a wood block, metal plate, or the like. [ 1913 Webster ]

Proof impression, one of the early impressions taken from an engraving, before the plate or block is worn. [ 1913 Webster ]

n. The quality of being impressionable. [ 1913 Webster ]

a. [ Cf. F. impressionnable. ] Liable or subject to impression; capable of being molded; susceptible; impressible; as, a bad influence on impressionable youths. [ 1913 Webster ]

He was too impressionable; he had too much of the temperament of genius. Motley. [ 1913 Webster ]

A pretty face and an impressionable disposition. T. Hook. [ 1913 Webster ]

n. The quality of being impressionable. [ 1913 Webster ]

n. [ F. impressionnisme. ] (Fine Arts) The theory or method of suggesting an effect or impression without elaboration of the details; -- a disignation of a recent fashion in painting and etching. [ 1913 Webster ]

n. [ F. impressionniste. ] (Fine Arts) One who adheres to the theory or method of impressionism in art; especially, a painter who paints in the impressionistic style; as, the skyrocketing prices of paintings by the French impressionists. [ 1913 Webster ]

a. Pertaining to, or characterized by, impressionism. [ 1913 Webster ]

a. Having the quality of not being impressed or affected; not susceptible. [ 1913 Webster ]

n. Pressure acting within. [ R. ] [ 1913 Webster ]

n. (Computers) The compression of binary data into a form which, when it is re-expanded, has most, but not all, of the original information. It is used primarily for compression of images and sounds, and is designed to provide a high degree of compression at the cost of a slight loss of data. It is expemplified by the JPEG compression standard. Images compressed by a lossy compression algorithm are re-expanded into an image close, but not identical to the original image; the difference between the original and the reconstructed image may be imperceptible to normal viewing by the eye. [ PJC ]

n. Wrong expression. [ 1913 Webster ]

n. [ F., fr. L. oppressio. ] 1. The act of oppressing, or state of being oppressed. [ 1913 Webster ]

2. That which oppresses; a hardship or injustice; cruelty; severity; tyranny. “The multitude of oppressions.” Job xxxv. 9. [ 1913 Webster ]

3. A sense of heaviness or obstruction in the body or mind; depression; dullness; lassitude; as, an oppression of spirits; an oppression of the lungs. [ 1913 Webster ]

There gentle Sleep
First found me, and with soft oppression seized
My drowsed sense. Milton. [ 1913 Webster ]

4. Ravishment; rape. [ Obs. ] Chaucer. [ 1913 Webster ]

n. (Painting) A theory or practice which is a further development, on more rigorously scientific lines, of the theory and practice of Impressionism, originated by George Seurat (1859-91), and carried on by Paul Signac (1863- -) and others. Its method is marked by the laying of pure primary colors in minute dots upon a white ground, any given line being produced by a variation in the proportionate quantity of the primary colors employed. This method is also known as (stippling). [ Webster 1913 Suppl. ]

n. (Painting) In the broadest sense, the theory or practice of any of several groups of painters of the early 1900's, or of these groups taken collectively, whose work and theories have in common a tendency to reaction against the scientific and naturalistic character of impressionism and neo-impressionism. In a strict sense the term post-impressionism is used to denote the effort at self-expression, rather than representation, shown in the work of Cézanne, Matisse, etc.; but it is more broadly used to include cubism, the theory or practice of a movement in both painting and sculpture which lays stress upon volume as the important attribute of objects and attempts its expression by the use of geometrical figures or solids only; and futurism, a theory or practice which attempts to place the observer within the picture and to represent simultaneously a number of consecutive movements and impressions. In practice these theories and methods of the post-impressionists change with great rapidity and shade into one another, so that a picture may be both cubist and futurist in character. They tend to, and sometimes reach, a condition in which both representation and traditional decoration are entirely abolished and a work of art becomes a purely subjective expression in an arbitrary and personal language. [ Webster 1913 Suppl. ]

n. [ L. pressio: cf. F. pression. See 4th Press. ] 1. The act of pressing; pressure. Sir I. Newton. [ 1913 Webster ]

2. (Cartesian Philos.) An endeavor to move. [ 1913 Webster ]

n. A second or repeated impression; a reprint. [ 1913 Webster ]

n. [ Cf. F. répression. ] [ 1913 Webster ]

1. The act of repressing, or state of being repressed; as, the repression of evil and evil doers. [ 1913 Webster ]

2. That which represses; check; restraint. [ 1913 Webster ]

n. [ L. suppressio: cf. F. suppression. ] 1. The act of suppressing, or the state of being suppressed; repression; as, the suppression of a riot, insurrection, or tumult; the suppression of truth, of reports, of evidence, and the like. [ 1913 Webster ]

2. (Med.) Complete stoppage of a natural secretion or excretion; as, suppression of urine; -- used in contradiction to retention, which signifies that the secretion or excretion is retained without expulsion. Quain. [ 1913 Webster ]

3. (Gram.) Omission; as, the suppression of a word. [ 1913 Webster ]

Syn. -- Overthrow; destruction; concealment; repression; detention; retention; obstruction. [ 1913 Webster ]

See high.
See honorable.
See hopeful.
See hostile.
See hurt.
See hhurtful.
See hygienic.
See ideal.
See idle.
See illusory.
See imaginable.
See imaginative.
See immortal.
See implicit.
See important.
See impressible. See >Unimpressible.
See impressionable.
See improvable.
See impugnable.
See incidental.
See increasable.
See indifferent.
See indulgent.
See industrious.
See inflammable.
See influential.
See ingenious.
See ingenuous.
See inhabitable.
See injurious.
See inquisitive.
See instructive.
See intelligent.
See intelligible.
See intentional.
See interesting.
See interpretable.
See inventive.
See investigable.
See jealous.
See joyful.
See joyous.
See justifiable.
See kingly.
See knightly.
See knotty.
See knowable.
See laborious.
See ladylike.
See level.
See libidinous.
See lightsome.
See limber.
See lineal.
See logical.
See lordly.
See losable.
See lovable.
See lucent.
See luminous.
See lustrous.
See lusty.
See maidenly.
See makable.
See malleable.
See manageable.
See manful.
See manlike.
See manly.
See marketable.
See marriable.
See marriageable.
See marvelous.
See masculine.
See matchable.
See matronlike.
See meek.
See meet.
See melodious.
See mendable.
See mentionable.
See mercenary.
See merciable.
See meritable.
See merry.
See metaphorical.
See mighty.
See mild.
See military.
See mindful.
See mingleable.
See miraculous.
See miry.
See mitigable.
See modifiable.
See modish.
See moist.
See monkish.
See motherly.
See muscular.
See musical.
See mysterious.
See namable.
See native.
See navigable.
See needful.
See negotiable.
See niggard.
See noble.
See objectionable.
[ 1913 Webster ]

[ 1913 Webster ]