Definition of love-in noun from the Oxford Advanced Learner's Dictionary

     

    love-in

     noun
    noun
    BrE
     
    ; NAmE
     
    (informal)
     
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  1. 1(old-fashioned) a party at which people freely show their affection and sexual attraction for each other, associated with hippies in the 1960s
  2. 2(disapproving) an occasion when people are being especially pleasant to each other, in a way that you believe is not sincere The Labour Party is getting together for its annual love-in.
  3. Word Origin 1960s: originally with reference to Californian hippy gatherings.
See the Oxford Advanced American Dictionary entry: love-in