- expression [ek spresh′ən, ikspresh′ən]n.[ME expressioun < L expressio < expressus: see EXPRESS]1. a pressing out or squeezing out, as of juice2. a putting into words or representing in language3. a picturing, representing, or symbolizing in art, music, etc.4. a manner of expressing; esp., a meaningful and eloquent manner of speaking, singing, etc. [to read with expression]5. a particular word, phrase, or sentence [“catch cold” is an idiomatic expression]6. a showing of feeling, character, etc. [laughter as an expression of joy]7. a look, intonation, sign, etc. that conveys meaning or feeling [a quizzical expression on the face]8. a symbol or set of symbols expressing some mathematical fact, as a quantity or operation9. a showing by a symbol, sign, figures, etc.10. Genetics the manifestation of a trait caused by a particular gene
English World dictionary. V. Neufeldt. 2014.