oc·to·ber \äkˈtōbə(r)\noun (-s) Usage: usually capitalized Etymology: Middle English octobre, from Old French, from Latin october (eighth month), from octo eight 1.: the tenth month of the Gregorian calendar — abbr. Oct.; see month table 2.Britain: ale made in October < sent down to the storehouse for a bottle of rum and a bottle of October — B.M.Carew >