Why is the ninth month called September?
late 14c., from Old French espresser "press, squeeze out; speak one's mind" (Modern French exprimer), Medieval Latin expressare, frequentative of exprimere "represent, describe," literally "to press out" (source of Italian espresso; the sense evolution here is perhaps via an intermediary sense of something like "clay that takes under pressure takes the form of an image"), from ex- "out" (see ex-) + pressare "to press, push," from Latin premere (see press (v.1)). Related: Expressed; expresses; expressing.
late 14c., from Old French expres, from Latin expressus "clearly presented," past participle of exprimere (see express (v.)). This led to the noun (first attested 1610s) meaning "special messenger." Sense of "business or system for sending money or parcels" is 1794. An express train (1841) originally ran to a certain station.
express ex·press (ĭk-sprěs')
v. ex·pressed, ex·press·ing, ex·press·es
To press or squeeze out.
To produce a phenotype. Used of a gene.