decorum
n.the way people behave in a polite or formal way. It is about showing respect and following social rules in a public setting.
n.the state of being polite, respectful, and appropriate in social or professional settings. Often refers to the maintenance of order and the suppression of inappropriate behavior.
“He lost his temper and broke the decorum of the meeting.”
“The formal dinner was ruined when the guest spoke loudly and without decorum during the opening toast.”
“Maintaining decorum in the courtroom is essential to ensure that the proceedings remain focused on the evidence rather than the personal conduct of the participants.”
Learned borrowing from Latin decōrum, neuter form of decōrus (“proper, decent”).
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.