IPA: //ˌkʌstəˈmɛrɪnəs//
KK: /ˈkʌstəmˌɛrɪnəs/
The condition of being usual or typical in a particular culture or society.
The customariness of certain traditions can vary greatly from one community to another.
Customariness → It is formed from "custom" (from Old French *costume*, meaning habit or practice) and "-ariness" (a suffix indicating a state or quality). The word "customariness" refers to the quality or state of being customary or habitual.
Think of 'custom' as a habit or practice, and remember that 'customariness' means the quality of being habitual.