The part of speech that modifies a verb, adjective, or other adverb.
Any of the words belonging to this part of speech, such as so, very, and rapidly.
[Middle English adverbe, from Old French, from Latin adverbium (translation of Greek epirrhēma) : ad-, in relation to; see ad- + verbum, word, verb; see wer-5 in Indo-European roots.]
(ād'vûrb) 