Noun gloom has 3 senses
  1. gloom, somberness, sombreness - a state of partial or total darkness; "he struck a match to dispell the gloom"
    --1 is a kind of semidarkness
  2. gloom, gloominess, somberness - a feeling of melancholy apprehension
    --2 is a kind of melancholy; apprehension, apprehensiveness, dread
  3. gloom, gloominess, glumness - an atmosphere of depression and melancholy; "gloom pervaded the office"
    --3 is a kind of atmosphere, ambiance, ambience
    --3 has particulars: cloud; bleakness, desolation
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