de·cen·cy / ˈdēsənsē/ • n. (pl. -cies) behavior that conforms to accepted standards of morality or respectability: she had the decency to come and confess. ∎ modesty and propriety. ∎ (decencies) the requirements of accepted or respectable behavior: an appeal to decencies. ∎ (decencies) things required for a reasonable standard of life.