From American Heritage,
DEFINITION: Base of prepositions and preverbs with the basic meanings of “forward,” “through,” ...
From Online Etymology Dictionary,
per (preposition) 1588 (earlier in various L. and Fr. phrases), from L. per "through, ...
perfidy from L. perfidia "falsehood, treachery," from perfidus "faithless," from phrase per fidem decipere "to deceive through trustingness," from per "through" (see per) + fidem, acc. of fides "faith" (see faith).
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