Established custom is a term that refers to a set of beliefs, practices, or behaviors that have been accepted and followed for a long period of time. Orthdoxy, which has nine letters, is a term used to describe the adherence to accepted beliefs and practices. USAGE, with five letters, is the customary practice of using something in a particular way. WONT, with four letters, is an established custom or habit. All of these terms are related to established custom, which is a set of accepted beliefs, practices, and behaviors that have been followed for a long period of time.