Learn how to say Adverbial correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word adverb:
a word or phrase that modifies the meaning of an adjective, verb, or other adverb, expressing manner, place, time, or degree (e.g. gently, here, now, very). Some adverbs, for example sentence adverbs, can also be used to modify whole sentences.
late Middle English: from Latin adverbium, from ad- ‘to’ (expressing addition) + verbum ‘word, verb’