a.

1. 断定性的
2. 【语】谓语的；表语的

n.

1. 【语】谓语；表语

adj.

1. Grammar  (of an adjective or other modifier) forming or contained in the predicate, as old in the dog is old (but not in the old dog). Contrasted with attributive.
   ▸denoting a use of the verb to be to assert something about the subject.
2. Logic  acting as a predicate.