CP Invariance Definition
sēpē
noun
In particle physics, a form of invariance in which reversing all spatial dimensions and the sign of all charges in the description of a physical system results in an indistinguishable physical system. CP invariance does not appear to hold in nature, as evidenced by the decay of kaons.
American Heritage
Origin of CP Invariance
c(harge) p(arity) invariance
From American Heritage Dictionary of the English Language, 5th Edition