What is the meaning of Decorum?

Appropriate social behavior.

A convention of social behavior.

seemliness, propriety

inflection of decōrus:

  1. nominative/accusative/vocative neuter singular
  2. accusative masculine singular

nominative/accusative/vocative neuter singular

accusative masculine singular

genitive plural of decor

decorum (principle of classical rhetoric, poetry, and theatrical theory concerning the fitness or otherwise of a style to a theatrical subject)

decorum (appropriate social behavior; propriety)

Source: wiktionary.org