commonality

noun

1. The common people; the commonalty
2. The joint possession of a set of attributes or characteristics.
3. Such a shared attribute or characteristic
4. A quality that applies to materiel or systems: (a) possessing like and interchangeable parts or characteristics enabling each to be utilized, or operated and maintained in common; (b) having interchangeable repair parts and/or components; (c) applying to consumable items interchangeably equivalent without adjustment.