Definition of "XP"

(software engineering) Initialism of Extreme Programming.  examples

(medicine) Initialism of Xeroderma Pigmentosum.  examples

(roleplaying games) Initialism of Experience Point.  examples

(motor racing) Abbreviation of extreme prix; xPrix.; from being an extreme grand prix.  examples

(computing) Ellipsis of Windows XP.  examples

(aviation, military, obsolete, US) eXperimental, Pursuit, fighter (prefix)

(grammar, X-bar theory) Initialism of X Phrase. (a phrase which consists of either: (1) an optional specifier and an X-bar phrase, or (2) a conjunction sandwiched between two other XPs. The X is a "pro-letter" which can be substituted by letters such as N for noun, V for verb, P for preposition, I for inflectional, etc.)  examples