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English word decency comes from Proto-Indo-European *dḱ-eh₁-yé-, Proto-Indo-European *dḱ-eh₁-(yé)-ti, Proto-Indo-European *dek-, and later Proto-Italic *dekēō (Fit, be right.)
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*dḱ-eh₁-yé- (Proto-Indo-European)
*dḱ-eh₁-(yé)-ti (Proto-Indo-European)
*dek- (Proto-Indo-European)
*deke- (Proto-Indo-European)
*dekēō (Proto-Italic)
Fit, be right.
decet (Latin)
It adorns. It is decent, suitable, seemly, or proper.
decentis (Latin)
decentia (Latin)
Decency, comeliness, becomingness.
decency (English)
That which is proper or becoming.. The quality of being decent; propriety.