pluralism

Short definition from Wiktionary

Noun

1. 1
   The quality or state of being plural, or in the plural number.
2. 2
   The state of a pluralist; the holding of more than one ecclesiastical living at a time.
3. 3
   A social system that permits smaller groups within a society to maintain their individual cultural identities.
4. 4
   The belief that there should be diverse and competing centers of power in society.
5. 5
   The acknowledgement of a diversity of political systems.
6. 6
   The existence of differing legal systems in a population or area.
7. 7
   The belief that values can be simultaneously antagonistic and incommensurable.
8. 8
   The belief that a plural predicate refers to its individuals rather than to a collective.