a tempo

adv. & adj. Music
In the tempo originally designated; resuming the initial tempo of a section or movement after a specified deviation from it. Used chiefly as a direction.

[Italian : a, in + tempo, time.]

(It.)

‘At tempo’: an instruction to return to the previous tempo after a deliberate deviation.

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tempo	hoover tempo
tempo ata133	tempo mechanical fuel gauge 6 gas by tempo