one day

(rare) the first day of the month

at most; at best; to the utmost / as far as possible; as much as possible

A unit of measure equal to 10³ m; (UK) kilometre, (US) kilometer.

at best, at most

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

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

he; boyfriend

all day