American Dictionary of the English Language

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DECO'RUM, noun [Latin to become.]

1. Propriety of speech or behavior; suitableness of speech and behavior, to one's own character, and to the characters present, or to the place and occasion; seemliness; decency; opposed to rudeness, licentiousness, or levity.

To speak and behave with decorum is essential to good breeding.

2. In architecture, the suitableness of a building, and of its parts and ornaments, to its place and uses.