Definition of expression in English:

expression

Line breaks: ex|pres¦sion
Pronunciation: /ɪkˈsprɛʃ(ə)n
 
, ɛk-/

noun

[mass noun]
  • 2 [count noun] A look on someone’s face that conveys a particular emotion: a sad expression
    More example sentences
    • Walter sat and watched Richard's pensive face as he read, which eventually led to an expression of horror and fury.
    • Jade nodded with a contemplative expression and led him down to the lower floors.
    • Miguel saw her happy facial expression falter and knew something was up.
    Synonyms
    look, appearance, air, manner, bearing, countenance, guise, cast, aspect, impression
    formal mien
  • 3 [count noun] A word or phrase, especially an idiomatic one, used to convey an idea: we have an expression, ‘You don’t get owt for nowt.’
    More example sentences
    • The first two are internal, one with simple word stems and the other with complex or idiomatic expressions.
    • The emphasis is on learning simple words and expressions while building vocabulary rather than grammar.
    • We all start out using the simplest expressions and watch our phrases become increasingly more precise.
    Synonyms
    idiom, phrase, idiomatic expression, set phrase; proverb, saying, adage, maxim, axiom, aphorism, saw, motto, platitude, cliché, quotation, quote, formula; term, word
    informal old chestnut
    formal locution
  • 3.1 Mathematics A collection of symbols that jointly express a quantity: the expression for the circumference of a circle is 2πr
    More example sentences
    • The first book studies generating functions and also approximations to various expressions occurring in probability theory.
    • Napier also found exponential expressions for trigonometric functions, and introduced the decimal notation for fractions.
    • The function is also most often described using a formula, in the form of an algebraic expression.
  • 5 Genetics The appearance in a phenotype of a characteristic or effect attributed to a particular gene: expression of the TAT gene is restricted to the parenchymal cells
    More example sentences
    • These two genes are both thought to be very important in the expression of the malignant phenotype.
    • All six genes putatively involved in biosynthetic processes have detectable expression.
    • As gene frequencies change, natural selection acts on the outcome, the expression of those genes.

Derivatives

expressional

adjective
More example sentences
  • His procedure was most carefully calculated in every respect to attain the maximum expressional power possible.
  • This narrative style is maintained throughout, with the expressional sophistication laid over the voices by often colourful orchestral means.
  • Throughout the book, she demonstrates the usefulness of drawing as an expressional tool for patients who are unable or unwilling to express themselves through the conventional use of language.

Origin

late Middle English: from Latin expressio(n-), from exprimere 'press out, express'. Compare with express1.

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