Meaning

noun the inside lower horizontal surface (as of a room, hallway, tent, or other structure)

noun a structure consisting of a room or set of rooms at a single position along a vertical scale

noun a lower limit

originInherited from Middle English floor, floour, flor, flore, flour, flur, vlor, from Old English flōr (“floor, pavement; deck; gangplank”), from Proto-West Germanic *flōr, from Proto-Germanic *flōraz (“ground; floor”), from Proto-Indo-European *pleh₂ros (“floor”), from Proto-Indo-European *pleh₂- (“flat”). Cognates Cognate with Scots flair, fluir (“floor”), Saterland Frisian Floor (“floor”), Dutch…

Etymology from Wiktionary, CC BY-SA 3.0