de·co·rum

[dih-kawr-uhm, -kohr-]
noun
1.
dignified propriety of behavior, speech, dress, etc.
2.
the quality or state of being decorous; orderliness; regularity.
3.
Usually, decorums. an observance or requirement of polite society.

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


1. politeness, manners, dignity. See etiquette.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
decorum (dɪˈkɔːrəm) [Click for IPA pronunciation guide]
 
n
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
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00:10
Decorum is a GRE word you need to know.
So is noisome. Does it mean:
offensive or disgusting, such as an odor; harmful or injurious to health
action or practice characteristic of a knave.
Etymonline
Word Origin & History

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

decorum

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.
Jazz taste oscillates between decorum and expression, usually favoring the
  latter.
Civility is under strain as the new economy prizes speed over decorum.
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