A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g. usted).
El asunto lo tratan Mascaró ("Ciencia para todos", 2014) y Cañabate ("Introducción a la física", idem).The matter is addressed by Mascaro ("Science for Everyone," 2014) and Canabate ("An Introduction to Physics," idem).
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).