XP

Etymology 1
An abbreviation.

Noun

 * 1)  ; from being an extreme grand prix.

Etymology 2
Combination of prefix P and prefix modifier X.

Prefix

 * 1)  eXperimental, Pursuit,

Etymology 3
X is a variable which can stand for letters representing parts of speech such as: N (noun), V (verb), P (preposition), etc.

Noun

 * 1)   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.

Etymology
Abbreviation.

Noun

 * 1)  ; from grand prix extrême