Wordnet 3.0
ADJECTIVE (1)
1. 
 of adjectives; 
 relating to or occurring within the predicate of a sentence; 
- Example: "`red' is a predicative adjective in `the apple is red'"
The Collaborative International Dictionary of English v.0.48:
Predicative \Pred"i*ca*tive\, a. [L. praedicativus.]
   Expressing affirmation or predication; affirming;
   predicating, as, a predicative term. -- Pred"i*ca*tive*ly,
   adv.
   [1913 Webster]
WordNet (r) 3.0 (2006):
predicative
    adj 1: of adjectives; relating to or occurring within the
           predicate of a sentence; "`red' is a predicative
           adjective in `the apple is red'" [ant: attributive,
           prenominal]