con·gru·ent /kənˈgruənt, ˈkɑŋgruənt/
  (a.)適合的,一致的,符合的,全等的
  Con·gru·ent a.  Possessing congruity; suitable; agreeing; corresponding.
     The congruent and harmonious fitting of parts in a sentence.   --B. Jonson.
  Congruent figures Geom., concurring figures.
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  congruent
       adj 1: corresponding in character or kind [syn: congruous] [ant:
              incongruous]
       2: coinciding when superimposed [ant: incongruent]