AC

えーしー
noun
air conditioning; alternating current
electronics
1. air conditioning; air conditioner
Abbreviation for air conditioning or air conditioner, commonly used in casual contexts.
ACを入(い)れてくれない？
Could you turn on the AC?
車(くるま)のACが壊(こわ)れた。
The car's air conditioning broke.
今日(きょう)は暑(あつ)いからACを強(つよ)めにしよう。
It's hot today, so let's turn up the AC.
ACをつけっぱなしで寝(ね)たら風邪(かぜ)を引(ひ)いた。
I caught a cold from sleeping with the AC on all night.
2. alternating current
Electrical term for alternating current, as opposed to DC (direct current).
ACで動(うご)く機械(きかい)です。
This is a machine that runs on AC power.
このアダプターはAC100Vに対応(たいおう)している。
This adapter supports 100V AC.

AC has two main meanings in Japanese:

Sense 1 - air conditioning

Sense 2 - alternating current

In casual conversation, Sense 1 is more common. Technical contexts typically make Sense 2 clear from context.

general
Added 2026.1.29 20:05 · Revised 2026.9.2 13:01
08500/08970_eeshii