Meaning

noun the smallest whole number or a numeral representing this number

noun one of four playing cards in a deck having a single pip on its face

noun someone who is dazzlingly skilled in any field

originInherited from Middle English as, from Old French as, from Latin as, assis (“unity, copper coin, the unit of coinage”), probably borrowed from Etruscan. Doublet of as.

Etymology from Wiktionary, CC BY-SA 3.0