A tempo is defined as the music direction which means to return to the original pace of a song.
An example of a tempo is when the music returns to the slow pace experienced at the beginning of the song.
Musical Direction in time: a note to the performer to return to the preceding tempo
Origin of a tempoItalian
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.
Origin of a tempoItalian a in tempo time