expression

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Related to Expressions: Idioms

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

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.

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.
References in classic literature ?
Heathcliff, be kind enough to bid this friend of yours release me: she forgets that you and I are not intimate acquaintances; and what amuses her is painful to me beyond expression.
The expression in the forehead, which had so particularly attracted his notice, and which was now immovable, had deepened into one of pain and horror.
The one is, that every part of the expression ought, if possible, to be allowed some meaning, and be made to conspire to some common end.
Had Elizabeth been able to encounter his eye, she might have seen how well the expression of heartfelt delight, diffused over his face, became him; but, though she could not look, she could listen, and he told her of feelings, which, in proving of what importance she was to him, made his affection every moment more valuable.
In this second group were several girls with exquisite figures and distinguished features, but there was little in their glance or expression that was simple and candid.
I recognized the quaint little gray curls, the gentle, genial expression, the mole at the corner of the mouth.
you should not blame them for a lack of the finer elements of feeling and expression which after a thousand years of civilization distinguish such delicate spirits as Keats and Tennyson.
I had feared to question Sola relative to the beautiful captive, as I could not but recall the strange expression I had noted upon her face after my first encounter with the prisoner.
An expression of unspeakable joy lightened the countenance of Milady; but this expression was fleeting as the reflection of lightning.
The eye of the invalid still retained that vacancy of expression which prevented his son from obtaining any knowledge of the feelings which were passing in his mind; he listened, nothing more.
If I have been so fortunate as to please here, then I am rewarded indeed," said the youth, with a bow and an expression that rendered it a little doubtful to which of the ladies the compliment was addressed.
Our caresses, our tender words, our still rapture under the influence of autumn sunsets, or pillared vistas, or calm majestic statues, or Beethoven symphonies all bring with them the consciousness that they are mere waves and ripples in an unfathomable ocean of love and beauty; our emotion in its keenest moment passes from expression into silence, our love at its highest flood rushes beyond its object and loses itself in the sense of divine mystery.