Etymology
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disco (n.)

1964, American English shortening of discotheque; sense extended by 1972 to the kind of dance music played there and the subculture of urban night-clubs built around it in the 1970s. As an adjective by 1965.

updated on August 24, 2018

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Definitions of disco from WordNet
1
disco (n.)
popular dance music (especially in the late 1970s); melodic with a regular bass beat; intended mainly for dancing at discotheques;
Synonyms: disco music
disco (n.)
a public dance hall for dancing to recorded popular music;
Synonyms: discotheque
2
disco (v.)
dance to disco music;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.