A traditional custom or an established practice, especially if it bears legal significance or enforceability.
—Ihihih, good evening, comradess Mommy! I see you're preparing a repast. What will it be when it will be, heheh, if I an permitted to delve into maternal dietological consuetudes?
—Potato stew with laurel leaves in a creamy sauce, sunny-side-ups.— Mam replied calmly. (Context: A social custodian inspects a family's dining practices in their home. Source: J∙ Okram - The Mystery of the Rammed Key.)