Meaning

noun position 12 in a countable series of things

noun one part in twelve equal parts

adjective coming next after the eleventh and just before the thirteenth in position

originFrom Middle English twelfthe, twelfte, from Old English twelfta (“twelfth”), from Proto-Germanic *twaliftô (“twelfth”), equivalent to twelve + -th (ordinal suffix). Cognate with Scots twalt (“twelfth”), Saterland Frisian tweelfte (“twelfth”), West Frisian tolfde (“twelfth”), Dutch twaalfde (“twelfth”), German Low German twalfde, twalvde (“twelfth”), German zwölfte (“twelfth”), Danish tolvte…

Etymology from Wiktionary, CC BY-SA 3.0