One o'clock (the hour of 1:00).
会議は一時に始まります。
The meeting starts at 1:00.
昼ご飯は一時に食べることが多い。
I often eat lunch at one o'clock.
電車は一時ちょうどに到着した。
The train arrived exactly at one o'clock.
Once; at one time; formerly — indicating that something was true in the past.
彼は一時、東京で働いていたことがある。
He once worked in Tokyo.
その店は一時とても流行っていた。
That shop was very popular at one time.
一時は世界一とも言われた選手だ。
He was once said to be the best in the world.
For a time; for the moment; temporarily — used to indicate something lasting only for a while.
一時的にサービスを停止します。
We will temporarily suspend the service.
忙しいので一時休憩しましょう。
We're busy, so let's take a short break for now.
そのソフトは一時、無料で配布されていた。
The software was distributed for free for a limited time.
Used as a prefix meaning 'one-time' or 'for a time' (e.g., 一時停止, 一時金).
工事のため一時停止の案内が出ています。
There is a notice of a temporary suspension due to construction.
給料とは別に一時金が支払われた。
A one-time payment was made in addition to the salary.