# 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 ?
At times, it feels like he's trying to test out a more relaxed cadence, finessing the threshold between animation and expressionlessness. Sometimes, he swaps out a reference to a city or a sports team just to see if it sounds funnier, or he changes the register of his voice when he's doing an imitation.
So much so that most were pictured perusing the aisles with the kind of glassy-eyed expressionlessness usually reserved for motorists found wandering the hard shoulders of motorways after pile-ups.
Though wearing the same haircut and world-weary expressionlessness as those in the paintings, these women - often accompanied by comic-style narration - are rapid-fire depictions of womanhood's mundane absurdities.

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