Other Word Forms of Fidelity
Origin of Fidelity
15th century, from Middle French fidélité, from Latin fidēlitās, from fidēlis (“faithful”), from fidēs (“faith, loyalty”) (English faith), from Proto-Indo-European *bʰidʰ-, zero-grade of Proto-Indo-European *bʰeydʰ- (“to command, to persuade, to trust”) (English bide).
Middle English fidelite from Old French from Latin fidēlitās from fidēlis faithful from fidēs faith bheidh- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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