Naturalize v. t. : To make natural; as, custom naturalizes labor or study.

Naturalize v. t. : To confer the rights and privileges of a native subject or citizen on; to make as if native; to adopt, as a foreigner into a nation or state, and place in the condition of a native subject.

Naturalize v. t. : To receive or adopt as native, natural, or vernacular; to make one's own; as, to naturalize foreign words.

Naturalize v. t. : To adapt; to accustom; to habituate; to acclimate; to cause to grow as under natural conditions.

Naturalize v. i. : To become as if native.

Naturalize v. i. : To explain phenomena by natural agencies or laws, to the exclusion of the supernatural.

Example:
What do you need to Naturalize yourself in El Salvador?

Taxonomy
naturalization, citizens, citizenship, law, naturalized, United States, nationality, naturalized citizens, aliens, Asians, World War I, British citizen, applicant, the Fourteenth Amendment, denaturalization laws, acts, dual citizenship, requirements.

Defination from the web:
... lived abroad (expatriates), western democracies were not ready to naturalize the massive influx of stateless people which followed massive ... There was some confusion about which courts could naturalize; the final ruling was that it could be done by any "court of record having common ...