one day

(rare) the first day of the month

(idiomatic, with negative sentence) no longer, not anymore

the aforementioned, the foregoing / greater than or equal to / (plain form Verb) + 以上は: since, now that, so long as, once

That is all. (used at the end of a text to indicate that there is nothing further)

one day, 24 hours / the daytime, the period from dawn until dusk / (figuratively) a short period of time / one day, someday, an unspecified day / the first day of the month

imagine / guess, suppose

imagination / guess, suppose

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend