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Cyan comments on Robust Cooperation in the Prisoner's Dilemma - Less Wrong
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It means consistent. PA + Con(PA) means PA together with the axiom that PA is consistent (which can be expressed in PA because PA can express "PA proves X," so "PA is consistent" can be expressed as "PA does not prove a contradiction").
More concretely, "PA is consistent" can be as expressed "PA does not prove 1 = 2".