A period of quiet, rest and relaxation especially after a party etc(noun)
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Use "chillout" in a sentence
"I first heard his stuff back in my College Radio days (yo, WRBC, what's up?), before people were calling the kind of music he makes "chillout" or "downtempo" - there wasn't really a name for it, it was just part of the spectrum of electronic music."
"I have since kind of moved away from a lot of this style of music - have you looked at the "chillout" section of a music store lately?"
"It features a variety of playlists from Billboard's charts, including rock, contemporary, country, and others organized into themes such as "chillout," "workout" and more."