GNU Collaborative International Dictionary of English

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1.       
   Decorous , a. [L. decōrus, fr. decor comeliness, beauty; akin to decere. See Decent, and cf. Decorum.] Suitable to a character, or to the time, place, and occasion; marked with decorum; becoming; proper; seemly; befitting; as, a decorous speech; decorous behavior; a decorous dress for a judge.
   1913 Webster
   A decorous pretext the war.
   Motley.
   -- De*co"rous*ly, adv. -- De*co"rous*ness, n.
   1913 Webster