Meaning of “adverb” - Learner’s Dictionary

adverb

noun [ C ] us uk /ˈædvɜːb/
Extra Examples
Sometimes it is unclear whether a word is an adverb or a preposition.He used the adverb 'swiftly'.

A2 a word that describes or gives more information about a verb, adjective, phrase, or other adverb. In the sentences 'He ate quickly.' and 'It was extremely good.', 'quickly' and 'extremely' are both adverbs.

(Definition of “adverb” from the Cambridge Learner’s Dictionary © Cambridge University Press)