A verb that does not follow the normal rules for its conjugation.

(grammar) A verb with an incomplete conjugation; for example, one that can only be conjugated in certain persons and numbers.

(grammar) A verb that agrees in person and number with the subject of a clause, by conjugation. Conjugation is a form of inflection.

(grammar) The verb in a clause with the highest semantic content.

(grammar) A verb that links a subject to a complement that refers to the subject.

(linguistics) A verb used only in the infinitive or in the third person. In the third person, the subject is either implied or a dummy.

(grammar) A verb that requires (in the unmarked form) both a direct object and an indirect object so as to be grammatical.

Copula, copulative verb.

(grammar) a verb whose primary function is to express grammatical mood

A verb whose subject and direct object are the same.