n. 1 the act or an instance of expressing. 2 a word or phrase expressed. 3 Math. a collection of symbols expressing a quantity. 4 a person's facial appearance or intonation of voice, esp. as indicating feeling. 5 depiction of feeling, movement, etc., in art. 6 conveying of feeling in the performance of a piece of music. expression-mark Mus. a sign or word indicating the required manner of performance. expressional adj. expressionless adj. expressionlessly adv. expressionlessness n.
[ ME f. OF expression or L expressio f. exprimere: see EXPRESS(1) ]