Noun tallness has 2 senses
  1. height, tallness - the vertical dimension of extension; distance from the base of something to the top
    --1 is a kind of dimension
    --1 has particulars: highness, loftiness; lowness
  2. tallness - the property of being taller than average stature
    --2 is a kind of
    stature, height
    Antonyms: shortness
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