A tempo is defined as the music direction which means to return to the original pace of a song.
(adverb)An example of a tempo is when the music returns to the slow pace experienced at the beginning of the song.
See a tempo in Webster's New World College Dictionary
Origin: It
See a tempo in American Heritage Dictionary 4
adverb & adj.
Origin:
Origin: Italian
Origin: : a, in
Origin: + tempo, time
.