Why is the ninth month called September?
1510s, "action of going forward," verbal noun from proceed (v.). From 1550s as "what is done, conduct." Proceedings "records of the doings of a society" is attested by 1824.
late 14c., "to go on," also "to emanate from, result from," from Old French proceder (13c., Modern French procéder) and directly from Latin procedere (past participle processus) "go before, go forward, advance, make progress; come forward," from pro- "forward" (see pro-) + cedere "to go" (see cede). Related: Proceeded; proceeding.