rev
回転数
解説 Definition
rev は revolution の略で、1回転や回転数という意味です。エンジンやモーターなどがどれだけ回っているかを話すときによく使われます。
An informal abbreviation of revolution meaning one complete turn, or the number or rate of turns made by an engine, motor, or rotating part. It is especially common when discussing engine speed, often in the plural or in measurements such as revs per minute.
覚え方のコツ Memory Tip
revolution「1回転」を短くした語で、機械やエンジンの回転を数える場面に使います。one rev は1回転、revs は複数の回転、rev counter は回転計です。rpm が revolutions per minute「毎分回転数」を表すことも一緒に覚えると、低い回転数・高い回転数という用法が整理できます。
Remember rev as the short mechanical form of revolution. One complete turn is one rev, while an engine running quickly makes many revs. Connect it with rpm, meaning revolutions per minute, and picture a tachometer rising as a motor spins faster. Common phrases include keep the revs low and increase the revs. The clipped spelling suits informal technical conversation. Be aware that rev can also function as a verb meaning to make an engine run faster, but in this entry it is the noun for a turn or rotational rate.
例文
The engine made one rev before it stopped.
エンジンは止まる前に1回転しました。
Keep the rev low while the machine is warming up.
機械が温まるまでは回転数を低く保ってください。
A higher rev can make the motor louder.
回転数が高いとモーターの音が大きくなることがあります。
rev の類義語・関連語
対義語
紛らわしい語
rev の語源・成り立ち Etymology
rev は revolution の略で、後期ラテン語 revolutio、さらにラテン語 revolvere にさかのぼります。re- は後ろへ、volvere は転がすで、revolve や revolution も同根なので、物がくるりと一回まわる回転数という意味が腑に落ちます。
Rev is a shortening of revolution in its mechanical sense of a complete turn. Revolution comes through Old French and Late Latin revolutio from Latin revolvere, “to roll back” or “turn around,” formed from re-, “back,” and volvere, “to roll.” Revolve belongs to the same family. The abbreviated noun became common in discussions of engines and machinery, particularly in the plural revs and in revs per minute.
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