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English word decor comes from Proto-Indo-European *deḱ-, and later Proto-Indo-European *déḱos (That which is proper.)
*deḱ- (Proto-Indo-European)
to take
*déḱos (Proto-Indo-European)
That which is proper.
*dekos (Proto-Italic)
Dignity.
decus (Latin)
(in plural) deeds of honor, honorable achievements. Grace, splendor, ornament, beauty. Honor, distinction, glory. Pride, dignity.
décor (French)
(theatre) set, location. Decor, decoration. Scenery, backdrop.
decor (English)
A stage setting; scenery; set; backdrop.. The style of decoration of a room or building.