A Regime of truth (n.) is a historically specific mechanism which produces discourses that function as true in particular times and places.
A Regime of truth (n.) of Islamic political martyrdom, which fascinated Foucault, measures truth not by facts, consistency or sincerity but by the readiness to die.
A Regime of truth (n.) is each society's general politics of truth: which discourses count as true, who may pronounce them, how the false is sorted out and punished.
Regime of truth (n.) is each society's general politics of truth: which discourses function as true, how true is told from false, and who has the status to say what counts as true.
Regime of truth (n.) is not merely ideological or superstructural: it was a condition of capitalism's formation, and it runs, slightly modified, in socialist countries too.
A Regime of truth (n.) is the type of discourse which a society accepts and makes function as true. It provides the mechanisms, techniques, and determines the status-bears who enable the particular distinctions between true and false statements in said society.