Word parts adverb + -ial Pronunciation (US) IPA (key): /ædˈvɝbi.əl/ (UK) IPA (key): /ədˈvɜːbi.əl/ Audio (UK)(file) Adjective Positive adverbial Comparative none Superlative none (grammar) If something is adverbial, it is related to an adverb. Noun Singular adverbial Plural adverbials (countable) (grammar) An adverbial is an adverbial word or phrase.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads