What is plurality?

Pluralism implies mutual respect between diverse groups. Answer

There are three answers to this question, I will give you all three, as I am not sure in which sense you asked this question.

Answer 1,

A condition in which numerous distinct ethnic, religious, or cultural groups are present and tolerated within a society.

i.e Great Britain, United States.

Answer 2,

The belief that no single explanatory system or view of reality can account for all the phenomena of life.

Answer 3,

The holding by one person of two or more positions or offices, especially two or more ecclesiastical benefices, at the same time.
Pluralism spelt incorrectly.

It can have more than 1 definition depending on usage-see below-