Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: decorus; DECOROUS

decorum

 noun
     
de‧co‧rum [uncountable]
formal behaviour that shows respect and is correct for a particular situation, especially a formal occasion:
He was disciplined for breaching the Senate's rules of decorum.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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