What is the meaning of congretion in colletive noun?

"Congregation" is indeed a collective noun. It refers to a group of people assembled for religious worship.

Here's a breakdown:

* Collective noun: A word that refers to a group of people or things.

* Congregation: Specifically, a group of people gathered for a religious service, usually in a church, synagogue, mosque, or other place of worship.

Example:

"The congregation stood to sing hymns."

This sentence indicates that a group of people (the congregation) are all standing together to sing.