1. An inhabitant; a resident.
2. One that frequents a particular place.
3. Ecology An animal or a plant naturalized in a region.
4. Chiefly British A foreigner who is granted rights of residence and sometimes of citizenship.
tr.v. den·i·zened, den·i·zen·ing, den·i·zens Chiefly British
To make a denizen of; grant rights of residence to.
From the book The Human Bobby (page 5) by Gabe Rotter.