cor·rel·a·tive /kəˈrɛlətɪv/
  (a.)有相互關係的,相關的有相互關係的物,相關語,關連詞
  Cor·rel·a·tive a.  Having or indicating a reciprocal relation.
     Father and son, prince and subject, stranger and citizen, are correlative terms.   --Hume.
  Cor·rel·a·tive, n.
  1. One who, or that which, stands in a reciprocal relation, or is correlated, to some other person or thing.
     Spiritual things and spiritual men are correlatives.   --Spelman.
  2. Gram. The antecedent of a pronoun.
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  correlative
       adj 1: mutually related [syn: correlate, correlated]
       2: expressing a reciprocal or complementary relation;
          "correlative conjunctions"
       n : either of two correlated variables [syn: correlate]