What is the meaning of Garrison?

A permanent military post.

The troops stationed at such a post.

Occupants.

A military unit, nominally headed by a colonel, equivalent to a USAF support wing, or an army regiment.

To assign troops to a military post.

To convert into a military fort.

To occupy with troops.

A de facto autonomous district controlled by a don and the don's armed gang, typically loyal to a political party; a favela; a slum.

Source: wiktionary.org