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

one day

Rome wasn't built in a day

(rare) the first day of the month

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

a male given name / a male given name

Latin alphabet / romaji (Japanese written in the standard 26-character latin script).

Romanization

Rome

一日, 1日: one day