One slice or cut of something.

one shaku and one sun

in ancient China, the paperboard on which the imperial decree was written, or the imperial decree

a unit of volume equal to 1,200 millet grains

Alternative spelling of 無花果

one vote

personal

full-fledged, qualified, up to standard / adulthood, behaving like an adult or as a member of the society / Used other than figuratively or idiomatically: see 一人, 前. ("one person's portion")

a handful / a small amount

a bath (a single instance of taking a bath)