Adjective low density has 2 senses
  1. low-density - having low relative density or specific gravity
    Antonym: heavy (indirect, via light)
  2. low-density - having low concentration; "low-density urban areas"
    Antonym: concentrated (indirect, via distributed)
,Noun low density has 1 sense
  1. rarity, tenuity, low density - a rarified quality; "the tenuity of the upper atmosphere"
    --1 is a kind of density, denseness
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