noun
one second
A unit of time equal to 1/60 of a minute. Used in everyday timing and measurements.
あと一秒で電車が出てしまう。
The train will leave in one more second.
一秒だけ待ってください。
Please wait just one second.
Means 'one minute', a longer unit of time.
Means 'one hour', a much longer unit of time.
Compound of 一 (いち, 'one') and 秒 (びょう, 'second'). The character 秒 originally referred to a small unit of time or a tiny part.