[dih-kawr-uhm, -kohr-]
dignified propriety of behavior, speech, dress, etc.
the quality or state of being decorous; orderliness; regularity.
Usually, decorums. an observance or requirement of polite society.

1560–70; < Latin decōrum, noun use of neuter of decōrus decorous

1. politeness, manners, dignity. See etiquette. Unabridged

dulce et decorum est pro patria mori

[dool-ke et de-koh-room est proh pah-tree-ah moh-ree; English duhl-see et di-kawr-uhm est proh pey-tree-uh mawr-ahy, mohr-ahy, -kohr-uhm]
sweet and fitting it is to die for one's country. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
decorum (dɪˈkɔːrəm)
1.  propriety, esp in behaviour or conduct
2.  a requirement of correct behaviour in polite society
[C16: from Latin: propriety]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1560s, from L. neuter of decorus "fit, proper," from decor (see decor).
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


in literary style, the appropriate rendering of a character, action, speech, or scene. The concept of literary propriety, in its simplest stage of development, was outlined by Aristotle. In later classical criticism, the Roman poet Horace maintained that to retain its unity, a work of art must be consistent in every aspect: the subject or theme must be dealt with in the proper diction, metre, form, and tone. Farcical characters should speak in a manner befitting their social position; kings should intone with the elegance and dignity commensurate with their rank

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Loss of civility and a sense of decorum and decency goes a long way toward
  explaining road rage writ large on the landscape.
Attorneys and parties should conduct themselves with decorum and manners.
Such decorum, however, did not always allow for personal disclosures.
Want of liberty, by strengthening law and decorum, stupefies conscience.
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