An Etymological Dictionary of Astronomy and Astrophysics

A word that serves to qualify a verb, an adjective, another adverb, or an entire sentence. More specifically, adverbs indicate manner, time, place, cause, or degree, and answer questions such as “how,” “when,” “where,” “how much.”

Etymology (EN): From L.L. adverbium “adverb,” literally “that which is added
to a verb,” from → ad- “to” + verbum “word, → verb,” a translation of Gk. epirrhema “adverb,” from → epi- “upon, on” + rhema “verb.”

Etymology (PE): Apivâz, from api-, → epi-, + vâz “word,” → verb.