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单词 involution
释义 involution
 /in'veuh looh"sheuhn/,  n.  
  1. an act or instance of involving or entangling; involvement.
  2. the state of being involved.
  3. something complicated.
  4.  Bot.  ,  Zool.  
   a. a rolling up or folding in upon itself.
   b. a part so formed.
  5.  Biol.   retrograde development; degeneration.
  6.  Physiol.   the regressive changes in the body occurring with old age.
  7.  Gram.   a complex construction in which the subject is separated from its predicate by intervening clauses or phrases.
  8.  Math.   a function that is its own inverse.
 [1605-15; < ML involution- (s. of involutio). See INVOLUTE, -ION]
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