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Noun dilatation has 2 senses
  1. dilatation, distension, distention - the state of being stretched beyond normal dimensions
    --1 is a kind of physiological state, physiological condition
    --1 has particulars: tympanites; ectasia, ectasis; varicocele
    Derived form: verb dilate1
  2. dilation, dilatation - the act of expanding an aperture; "the dilation of the pupil of the eye"
    --2 is a kind of expansion, enlargement
    --2 has particulars: vasodilation; mydriasis
    Derived form: verb dilate1
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