What is the meaning of Colonizer?

One who colonizes:

1. One who makes a group or place into a colony; one who establishes a colonial relationship.

   One who makes a group or place into a colony; one who establishes a colonial relationship.

   One who establishes a colony; one who joins a colony or is born and raised there.

   One who intrudes and takes over.

   A species that establishes itself in a new area.

   A white person.

   Source: wiktionary.org