Meaning

noun position eight in a countable series of things

noun one part in eight equal parts

adjective coming next after the seventh and just before the ninth in position

originEtymology tree Proto-Indo-European *oḱtṓw Proto-Indo-European *oḱtowós Proto-Germanic *ahtudô Proto-West Germanic *ahtudō Old English eahtoþa Middle English eightethe English eighth Inherited from Middle English eightethe, from Old English eahtoþa, from Proto-Germanic *ahtudô; equivalent to eight + -th (ordinal suffix).

Etymology from Wiktionary, CC BY-SA 3.0