What does "verb" mean?

Verb: (Gram.) A word which affirms or predicates something of some person or thing; a part of speech expressing being, action, or the suffering of action. Note: A verb is a word whereby the chief action of the mind [the assertion or the denial of a proposition] finds expression. Earle. Active verb, Auxiliary verb, Neuter verb, etc. See Active, Auxiliary, Neuter, etc.