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The Collaborative International Dictionary of English v.0.48:

Perfidy \Per"fi*dy\ (p[~e]r"f[i^]*d[y^]), n.; pl. Perfidies (p[~e]r"f[i^]*d[i^]z). [L. perfidia, fr. L. perfidus faithless; per (cf. Skr. par[=a] away) + fides faith: cf. F. perfidie. See Faith.] The act of violating faith or allegiance; violation of a promise or vow, or of trust reposed; faithlessness; treachery. [1913 Webster] The ambition and perfidy of tyrants. --Macaulay. [1913 Webster] His perfidy to this sacred engagement. --DeQuincey. [1913 Webster]