Fidelity

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Fidelity is a notion, that at its most abstract level implies a truthful connection to a source. It's original meaning dealt with loyalty to a lord or a king, which was derived from one's responsibility or duty.

In recent times, fidelity has come to denote how accurate a copy is to its source. Recording media like vinyl records have a lower fidelity than digital files, for example.

Fidelity in a human relationship (mainly marriage) is generally held to mean monogamy and a lack of adultery.