1. the quality or state of being customary; the fact of being usual, habitual, or established by long practice

Examples

• The customariness of the morning coffee ritual made it feel essential to her daily routine.
• Due to the customariness of the practice, few people questioned its origins.
• The customariness of handshakes in business settings varies across different cultures.
• He appreciated the customariness of family dinners on Sunday evenings.
• The customariness of wearing uniforms in schools has been debated by educators.
• What once seemed unusual has gained customariness through repeated exposure.