Definition of “adverb” - English Dictionary

“adverb” in British English

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adverbnoun [ C ]

uk /ˈæd.vɜːb/ us /ˈæd.vɝːb/

A2 a word that describes or gives more information about a verb, adjective, adverb, or phrase:

In the phrase "she smiled cheerfully", the word "cheerfully" is an adverb.
In the phrase "the house was spotlessly clean", the word "spotlessly" is an adverb.

More examples

adverbial
adjective uk /ədˈvɜː.bi.əl/ us /ədˈvɝː.bi.əl/

an adverbial phrase

Grammar

(Definition of “adverb” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“adverb” in American English

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adverbnoun [ C ]

us /ˈæd·vɜrb/ specialized

grammar a word that describes or gives more information about another word, esp. a verb, adjective, or other adverb, or about a phrase:

In the sentences, "She smiled cheerfully" and "He waited right outside the door," "cheerfully" and "right" are adverbs.
adverbial
adjective [ not gradable ] us /ædˈvɜr·bi·əl/

an adverbial phrase

(Definition of “adverb” from the Cambridge Academic Content Dictionary © Cambridge University Press)