noun
one o'clock
Refers to the time of day, 1:00. Used with 午前/午後 for AM/PM.
会議は午後一時から始まります。
The meeting starts at 1 p.m.
adverb, noun
Indicates a past state or action that is no longer true. Often used with ～したことがある or in narrative contexts.
彼は一時、海外で働いていた。
He once worked abroad.
この町は一時、とても賑やかだった。
This town was once very lively.
adverb, noun, noun which may take the genitive case particle 'no'
for a while; temporarily; for the time being
Describes a temporary state or action lasting for a limited period. In weather forecasts, indicates a condition holding for less than one quarter of the forecast period.
雨は一時的に強くなるでしょう。
The rain will temporarily become heavy.
彼は一時、部屋を出ていた。
He was out of the room for a while.
noun, used as a prefix
one-time; a single occurrence
Used as a prefix to mean 'one-time' or 'single', often in compounds like 一時金 (lump-sum payment) or 一時的 (temporary).
退職時に一時金を受け取った。
I received a lump-sum payment upon retirement.