CP invariance 
(sēpē)
(sēpē)n.
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. Also called charge parity invariance.
[c(harge) p(arity) invariance.]
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