noun
one beat; a single beat
Music term, often used in phrases like ワンテンポ遅れる (to be a beat behind) or ワンテンポ早い (a beat early). Wasei-eigo from English 'one tempo'.
wasei-eigo (Japanese-coined English), from one tempo
彼のギターはワンテンポ遅れている。
His guitar is a beat behind.
ドラムがワンテンポ早く入ってしまった。
The drums came in a beat too early.