- the action of a gene in the production of a protein or a phenotype.
- expressivity(def 2).
Origin of expression
Examples from the Web for expressional
The expressional changes of pitch, which constitute the 'melody,' or the 'inflections' of the sentences, play an important part.
He would have none of a formal and merely decorative beauty—a beauty serving no expressional need of the heart or the imagination.Edward MacDowell|Lawrence Gilman
The expressional impulse is not satisfied by the resonance which an occasional public, however sympathetic, is able to afford.
As a result of this craving the expressional activities lead to artistic production.
Yet it was these emotional, expressional women that Annabel Vyner naturally joined.I, Thou, and the Other One|Amelia Edith Huddleston Barr
British Dictionary definitions for expressional
Word Origin and History for expressional
early 15c., "action of pressing out;" later (mid-15c.) "action of manifesting a feeling;" (late 15c.) "a putting into words," from Middle French expression (14c.), from Late Latin expressionem (nominative expressio), noun of action from past participle stem of exprimere (see express (v.)). Meaning "an action or creation that expresses feelings" is from 1620s. Of the face, from 1774. Occasionally the word also was used literally, for "the action of squeezing out."