1. At ease, at leisure, slowly; such as, a musical passage, movement, or piece in adagio time.
2. Slowly: used as an instruction saying how a piece of music should be played or sung.
3. A slow ballet dance in which the female partner is supported or lifted while she holds various poses.
4. Etymology: Late 17th century from Italian, "at ease".

"Slowly, leisurely" from Italian ad agio, from ad, "to, at" + agio, "leisure"; which came from Vulgar (Common) Latin adjacens, adjacere, "to lie at, to lie near".