The Collaborative International Dictionary of English v.0.48:
Tempo \Tem"po\, n. [It., fr. L. tempus. See Tense, n.] (Mus.) The rate or degree of movement in time. [1913 Webster] A tempo giusto (j[=oo]s"t[-o]) [It.], in exact time; -- sometimes, directing a return to strict time after a tempo rubato. Tempo rubato. See under Rubato. [1913 Webster]