Merriam-Webster Collegiate Dictionary - adverb

 I. noun  Etymology: Middle English ~e, from Middle French, from Latin ~ium, from ad- + verbum word — more at 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 ~, 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 — compare adjunct, conjunct, disjunct  II. adjective  Date: 1879 ~ial