An adverb is simply a word that describes a verb. He ate his breakfast quickly. The word 'quickly' is an adverb as it tells us how he 'ate' (the verb) his breakfast.

An adverb is simply a word that describes a verb (an action or a doing word).

An adverb is a part of speech that usually modifies a verb.

The meaning of ADVERB is a word belonging to one of the major form classes in any of numerous languages, typically serving as a modifier of a verb, an adjective, another adverb, a preposition, a phrase, a clause, or a sentence, expressing some relation of manner or quality, place, time, degree, number, cause, opposition, affirmation, or denial, and in English also serving to connect and to express comment on clause content.

An adverb is a word that provides information about other words in a sentence. It works to clarify and add details about how, what, where, or when something occurs.