(a.) of or pertaining to an adverb; of the nature of an adverb; as, an adverbial phrase or form.

adjectival adverb adverbial adversative conjunction attributive conjunction conjunctive adverb coordinating conjunction copulative copulative conjunction correlative conjunction disjunctive disjunctive conjunction exclamatory noun form class form word function class gerundive interjection part of speech participle particle past participle perfect participle preposition present participle subordinating conjunction verbal adjective