'XP' definitions:

Definition of 'XP'

From: GCIDE

XP \XP\ [Belongs here in appearance only.] The first two letters of the Greek word XRISTOS, Christ; -- an abbreviation used with the letters separate or, oftener, in a monogram, often inclosed in a circle, as a symbol or emblem of Christ. It use as an emblem was introduced by Constantine the Great, whence it is known as the
Constantinian symbol, or
monogram. See Labarum. [Webster 1913 Suppl.]

Acronyms for 'XP'

[Windows] eXPerience (MS, Windows, OS)
eXtreme Programming

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