pro·noun 
(prōnoun′)
(prōnoun′)n. Abbr. pron. or pr.
1. The part of speech that substitutes for nouns or noun phrases and designates persons or things asked for, previously specified, or understood from the context.
2. Any of the words within this part of speech, such as he or whom.
[Late Middle English pronoun, pronoune, partial translation of Latin prōnōmen (translation of Greek antōnumiā, interchange of names, pronoun) : prō-, pro- + nōmen, name, noun.]