verb

n. part of speech used to express action or state of being or the relationship between the subject and object in a sentence (Grammar)

In syntax, a verb is a word belonging to the part of speech that usually denotes an action (bring, read), an occurrence (decompose, glitter), or a state of being (exist, stand). Depending on the language, a verb may vary in form according to many factors, possibly including its tense, aspect, mood and voice. It may also agree with the person, gender, and/or number of some of its arguments (subject, object, etc.).
See more at Wikipedia.org...

n. verb, word which expresses action condition or relationship (Grammar)

(n.)
A word; a vocable.
  

(n.)
A word which affirms or predicates something of some person or thing; a part of speech expressing being, action, or the suffering of action.
  

Noun
1. a word that serves as the predicate of a sentence
(hypernym) major form class
(hyponym) infinitive
(member-holonym) conjugation
(derivation) verbify
2. a content word that denotes an action or a state
(hypernym) content word, open-class word
(hyponym) reflexive verb
(derivation) verbify