all day

question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

entirely, quite; completely; just like, so to speak, as though, as if

a circle / a sphere, ball / (by extension) any non-perfectly round objects, such as an oval / the "○" symbol, equivalent to a check mark in some other languages

the first day of the month (solar or lunar calendar)

(obsolete) one day, 24 hours / (obsolete) the daytime, the period from dawn until dusk

(rare, obsolete) (all senses appear to be identical as for hitohi above)

(literary) one day, 24 hours / (literary) the daytime, the period from dawn until dusk / (literary) (figuratively) a short period of time

a surname

suffix for ship names