n [U] dignified and socially acceptable behaviour 端庄得体
*In the presence of elderly visitors our son was a model of decorum. 我们的儿子在来访的长辈面前彬彬有礼.
[Date: 1500-1600; Language: Latin;Origin: decorus; DECOROUS]
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.