expression

An example of expression is a a frequently used word or phrase or it is a way to convey your thoughts, feelings or emotions. (noun)

See expression in Webster's New World College Dictionary

noun

a pressing out or squeezing out, as of juice
a putting into words or representing in language
a picturing, representing, or symbolizing in art, music, etc.
a manner of expressing; esp., a meaningful and eloquent manner of speaking, singing, etc.: to read with expression
a particular word, phrase, or sentence: “catch cold” is an idiomatic expression
a showing of feeling, character, etc.: laughter as an expression of joy
a look, intonation, sign, etc. that conveys meaning or feeling: a quizzical expression on the face
a symbol or set of symbols expressing some mathematical fact, as a quantity or operation
a showing by a symbol, sign, figures, etc.
Genetics the manifestation of a trait caused by a particular gene

See expression in American Heritage Dictionary 4

(ĭk-sprĕshˈən)

noun

The act of expressing, conveying, or representing in words, art, music, or movement; a manifestation: an expression of rural values.
Something that expresses or communicates: Let this plaque serve as an expression of our esteem.
Mathematics A symbol or combination of symbols that represents a quantity or a relationship between quantities.
The manner in which one expresses oneself, especially in speaking, depicting, or performing.
A particular word or phrase: “an old Yankee expression . . . ‘Stand up and be counted’” (Charles Kuralt).
The outward manifestation of a mood or a disposition: My tears are an expression of my grief.
A facial aspect or a look that conveys a special feeling: an expression of scorn.
The act of pressing or squeezing out.
Genetics The act or process of expressing a gene.