one day

one time / one round; one bout

A solar year, the time it takes the Earth to complete one revolution of the Sun (between 365.24 and 365.26 days depending on the point of reference)

(a duration of) one year / an unspecified year in the past

one, 1 / the first in order, foremost / the beginning / the best / a kind of; one of something / (card games) an ace / unity / the bottom string of a shamisen or other Japanese musical instrument

each person

Alternative form of 一々

occurrences / innings in baseball, games, rounds / (Kansai) indicating year of university students

once again, once more

all at once