Why is the ninth month called September?
"spoken," 1570s, past participle adjective from pronounce (v.). Sense of "emphatic" is a figurative meaning first attested c.1730.
early 14c., "to declare officially;" late 14c., "to speak, utter," from Old French prononcier "declare, speak out, pronounce" (late 13c., Modern French prononcer), from Late Latin pronunciare, from Latin pronuntiare "to proclaim, announce; pronounce, utter," from pro- "forth, out, in public" (see pro-) + nuntiare "announce," from nuntius "messenger" (see nuncio). With reference to the mode of sounding words or languages, it is attested from 1620s (but cf. pronunciation in this sense early 15c.). Related: Pronounced; pronouncing.