# 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.

## 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 periodicals archive ?
Ignoring the bodyguards, Li waited expressionlessly for the Arab to turn to face him and provide the targeting information.
"It was almost as if you can feel the toxics escaping and the tonics and the vitamins going in" she expressionlessly exclaims.
And I say it like I'm impressed and delighted that he's got my number when I respond, "Ha ha, how do you know that?" but really I don't know if he means, "Anybody can tell this chick drinks her whiskey straight," or "I know for a fact she drinks her whiskey straight because someone's following her." I don't feel better about it either way when he answers me expressionlessly, "I'm not a prophet."
None of this is real, of course, but even during the technical rehearsals for the Everyman's new show Anthology - with the stage manager expressionlessly reading the actor's words and the backstage crew tinkering with sound equipment on a trolley - it is possible to be caught up in the fiction.
(71) In De Bray's panel, Barak's doppelganger sits astride a white horse at the front of a triumphal procession, gazing expressionlessly ahead.

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