expression

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expression

1. communication of emotion through music, painting, etc.
2. Maths a variable, function, or some combination of constants, variables, or functions
3. Genetics the effect of a particular gene on the phenotype
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

expression

[ik′spresh·ən]
(chemical engineering)
Separation of liquid from a two-phase solid-liquid system by compression under conditions that permit liquid to escape while the solid is retained between the compressing surfaces. Also known as mechanical expression.
(computer science)
A mathematical or logical statement written in a source language, consisting of a collection of operands connected by operations in a logical manner.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

expression

(programming)
Any piece of program code in a high-level language which, when (if) its execution terminates, returns a value. In most programming languages, expressions consist of constants, variables, operators, functions, and parentheses. The operators and functions may be built-in or user defined. Languages differ on how expressions of different types may be combined - with some combination of explicit casts and implicit coercions.

The syntax of expressions generally follows conventional mathematical notation, though some languages such as Lisp or Forth have their own idiosyncratic syntax.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

expression

(1) See Expression Studio.

(2) In programming, a line of source code that returns a value when executed. An expression can comprise any combination of variables, values, operators and functions. For example, a=b+c and price=2*cost are expressions. The more complicated expression (strlen(text_string)*2) is a C example that uses a string length function and returns a value that is twice the number of characters in the string of text. See regular expression.
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References in classic literature ?
The first expression of surprise passed from her face.
Franz d'Epinay." An expression of intense joy illumined the old man's eyes.
At these words there appeared in Noirtier's eye an expression of such deep meaning that the young girl thought she could read these words there: "You are mistaken; I can still do much for you."
But, the moment that George was called on to take his part in the entertainment, this restlessness disappeared, and was succeeded by an expression of intense interest and deep anxiety.
Maria made no reply, but turned her eyes on Delafield, with an affected expression of melancholy that excited another laugh in her friend.
"By the smile that has just marred the expression of your countenance, Be candid, and tell me what your thought was -- no secrets between friends."
Prince Vasili said no more and his cheeks began to twitch nervously, now on one side, now on the other, giving his face an unpleasant expression which was never to be seen on it in a drawing room.
The princess continued to look at him without moving, and with the same dull expression.
What is the author's attitude toward Nature--(1) does he view Nature in a purely objective way, as a mass of material things, a series of material phenomena or a mere embodiment of sensuous beauty; or (2) is there symbolism or mysticism in his attitude, that is--does he view Nature with awe as a spiritual power; or (3) is he thoroughly subjective, reading his own moods into Nature or using Nature chiefly for the expression of his moods?
But his whole face suddenly bore the solemn rigidity of the dead, and his expression did not change during the whole time of the drive home.
Her voice, of immense power and sublime expression, gave to the rude, unpolished poetry of these psalms a magic and an effect which the most exalted Puritans rarely found in the songs of their brethren, and which they were forced to ornament with all the resources of their imagination.
He chooses to depict people from humble life, because, being nearer to nature than others, they are on the whole more impassioned, certainly [102] more direct in their expression of passion, than other men; it is for this direct expression of passion that he values their humble words.