Noun farewell has 2 senses
  1. farewell, word of farewell - an acknowledgment or expression of goodwill at parting
    --1 is a kind of acknowledgment, acknowledgement
    --1 has particulars:
     adieu, adios, arrivederci, auf wiedersehen, au revoir, bye, bye-bye, cheerio, good-by, goodby, good-bye, goodbye, good day, sayonara, so long; bon voyage, send-off; good morning, morning; good afternoon, afternoon; good night
  2. farewell, leave, leave-taking, parting - the act of departing politely; "he disliked long farewells"; "he took his leave"; "parting is such sweet sorrow"
    --2 is a kind of departure, going, going away, leaving
    --2 has particulars: valediction
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