Noun afternoon has 2 senses
  1. afternoon - the part of the day between noon and evening; "he spent a quiet afternoon in the park"
    --1 is a kind of
    day, daytime, daylight
    --1 has part: midafternoon
  2. good afternoon, afternoon - a conventional expression of greeting or farewell
    --2 is a kind of greeting, salutation; farewell, word of farewell
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