con·junc·tive / kənˈjəng(k)tiv/ • adj. serving to join; connective: the conjunctive tissue. ∎ involving the combination or co-occurrence of two or more conditions or properties: conjunctive hypotheses are simpler to process than negative or disjunctive ones. ∎ Gram. of the nature of or relating to a conjunction.• n. Gram. a word or expression acting as a conjunction.DERIVATIVES: con·junc·tive·ly adv.