Etymology

decorum

de·co·rum
D2E1C3O1R1U1M3

Today it means: Appropriate social behavior. Full definition →

Latin decōrum
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The story

  1. Latin · learned borrowing fromdecōrum
  2. English todaydecorum

Learned borrowing from Latin decōrum, neuter form of decōrus (“proper, decent”).

Etymology from Wiktionary, CC BY-SA 4.0.