n. [ L. decōrum, fr. decōrus. See Decorous. ] Propriety of manner or conduct; grace arising from suitableness of speech and behavior to one's own character, or to the place and occasion; decency of conduct; seemliness; that which is seemly or suitable. [ 1913 Webster ]

Negligent of the duties and decorums of his station. Hallam. [ 1913 Webster ]

If your master
Would have a queen his beggar, you must tell him,
That majesty, to keep decorum, must
No less beg than a kingdom. Shak.

Syn. -- Decorum, Dignity. Decorum, in accordance with its etymology, is that which is becoming in outward act or appearance; as, the decorum of a public assembly. Dignity springs from an inward elevation of soul producing a corresponding effect on the manners; as, dignity of personal appearance. [ 1913 Webster ]

n. [ Pref. in- not + decorum: cf. L. indecorous unbecoming. ] [ 1913 Webster ]

1. Lack of decorum; impropriety of behavior; that in behavior or manners which violates the established rules of civility, custom, or etiquette; indecorousness. [ 1913 Webster ]

2. An indecorous or unbecoming action. Young.

Syn. -- Indecorum is sometimes synonymous with indecency; but indecency, more frequently than indecorum, is applied to words or actions which refer to what nature and propriety require to be concealed or suppressed. Indecency is the stronger word; indecorum refers to any transgression of etiquette or civility, especially in public. [ 1913 Webster ]