Merriam-Webster's Collegiate® Dictionary, 11th Edition
ADVERB
I. noun see: word
Date: 14th century
a word belonging to one of the major form classes in any of numerous languages, typically serving as a modifier of a verb , an adjective , another adverb , a preposition, a phrase, a clause, or a sentence, expressing some relation of manner or quality, place, time, degree, number, cause, opposition, affirmation, or denial, and in English also serving to connect and to express comment on clause content,
II. adjective
Date: 1879
adverb ial