Dictionary.net

• a style of rock music that emerged in the 1970s; associated with attempts to combine rock with jazz and other forms; intended for listening and not dancing

2006 - WordNet 3.0
By Princeton University

• a style of rock music that emerged in the 1970s; associated with attempts to combine rock with jazz and other forms; intended for listening and not dancing

2011 - English Dictionary Database
By DataStellar Co., Ltd