Wiktionary
downtempo
a. 1 (context music English) Having a slow tempo. 2 Having a slow, relaxed pace. adv. 1 (context music English) Having a slow tempo. 2 Having a slow, relaxed pace.
Wikipedia
Downtempo
Downtempo (sometimes referred to as chillout, chill or downbeat) is a genre of electronic music similar to ambient, but with a greater emphasis on rhythm. Examples may incorporate "slow, tranquilized beats, garish synths, and melodies that sound like they were filtered through the AM radio of an '84 Dodge Dart."