GNU Collaborative International Dictionary of English

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1.       
   Expression (ĕks‑prĕshˈŭn), 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”.
   
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   2. The act of declaring or signifying; declaration; utterance; as, “an expression of the public will”.
   
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   With this tone of philosophy were mingled expressions of sympathy. Prescott.
   
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   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.”
   
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   The imitators of Shakespeare, fixing their attention on his wonderful power of expression, have directed their imitation to this. M. Arnold.
   
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   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.
   
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   It still wore the majesty of expression so conspicuous in his portraits by the inimitable pencil of Titian. Prescott.
   
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   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.”
   
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   6. (Math.) The representation of any quantity or relation by appropriate characters or symbols, usually in a specific order.
   
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   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”,
   
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   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.
   
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     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.
   
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   Past expression, Beyond expression, beyond the power of description. “Beyond expression bright.”  Milton.
   
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