the first / (mathematics, attributive) the quality of being first-degree

Used other than figuratively or idiomatically: see 一 and 本 (one thing) / Short for 一本勝ち (ippon-gachi, “winning in one blow”).

a night

step; pace

one (of anything) / a, an

one (of anything) / a, an

(literary) an alternate name

first-year student of an elementary school

one time / one round; one bout

Synonym of 万 (“ten thousand”)