Of, relating to, or functioning as an adverb; modifying a verb, adjective, or another adverb.
From Medieval Latin 'adverbialis,' derived from Latin 'adverbium' (adverb, literally 'word added to a verb'). The Latin 'ad-' means 'to' and 'verbum' means 'word' or 'verb.'
The word 'adverb' itself literally means 'a word added to a verb' in Latin, but that's not quite accurate—adverbs modify many things, not just verbs. The name stuck despite being technically imprecise, showing how language history sometimes preserves outdated definitions.
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