Why is the ninth month called September?
1760, "deep gorge," from French ravin "a gully" (1680s, from Old French raviner "to pillage, sweep down, cascade"), and from French ravine "violent rush of water, gully worn by a torrent," from Old French ravine "violent rush of water, waterfall; avalanche; robbery, rapine," both ultimately from Latin rapina "act of robbery, plundering" (see rapine); sense influenced by Latin rapidus "rapid." Middle English ravine meant "booty, plunder, robbery" from c.1350-1500. Cf. ravening.