decorum
/dɪˈkɔːrəm/noun
mass noun
1- behaviour in keeping with good taste and propriety礼貌; 正派得体。
1.1
- etiquette礼仪：
he had no idea of funeral decorum.
他对殡葬的礼仪一无所知。
1.2
- count noun（一般作decorums）archaic a particular requirement of good taste and propriety〈古〉礼仪要求。
1.3
- archaic suitability to the requirements of a person, rank, or occasion〈古〉得体, 合宜, 相称。
词源
mid 16th cent. （as a literary term， denoting suitability of style）： from Latin， neuter of the adjective decorus 'seemly'.