Alien registration records document non-citizens residing within a country. In the United States, large-scale alien registrations occurred during periods such as World War I and World War II. These records often contain detailed personal information and specialized terminology related to immigration status and legal identification.
| Term | Definition |
| Alien | Person who is not a citizen of the country. |
| Alien Registration Number (A-Number) | Unique identifier assigned to non-citizen. |
| Alien Registration Form | Official document recording non-citizen information. |
| Certificate of Registration | Document issued after alien registers with authorities. |
| Country of Origin | Nation where individual was born or last resided. |
| Date of Entry | Date individual entered the country. |
| Declaration of Intent | First step toward naturalization. |
| Deportation | Removal of individual from country. |
| Domicile | Legal place of residence. |
| Entry Permit | Authorization to enter a country. |
| Exclusion | Denial of entry into a country. |
| Fingerprinting | Process of recording fingerprints for identification. |
| Immigration Act | Law governing immigration policy. |
| Immigration Officer | Official responsible for enforcing immigration laws. |
| Immigration Status | Legal classification of non-citizen. |
| Internment | Detention during wartime. |
| Legal Resident | Non-citizen authorized to live in country. |
| Naturalization | Process of becoming citizen. |
| Non-Immigrant | Person entering temporarily. |
| Passport | Official travel document issued by country of citizenship. |
| Permit to Reenter | Authorization allowing return after leaving country. |
| Place of Birth | Location where individual was born. |
| Port of Entry | Location where person entered country. |
| Registration Card | Identification issued to registered alien. |
| Registration District | Area where registration occurred. |
| Resident Alien | Non-citizen living in country permanently. |
| Visa | Authorization allowing entry into country. |
| Visa Number | Identifier assigned to visa document. |
| Wartime Registration | Mandatory registration during conflict period. |
| Alien Enemy | National of country at war with host nation. |
| Entry Record | Documentation of arrival in country. |
| Identification Card | Official document verifying identity. |
| Immigration File | Collection of records related to individual. |
| Travel Document | Paperwork required for international movement. |
| Citizenship Status | Legal standing regarding nationality. |
| Alien File (A-File) | Official record maintained on non-citizen. |
| Border Crossing Record | Documentation of crossing into country. |
| Immigration Law | Legal framework governing entry and residence. |
| Deportation Order | Official directive requiring removal. |
| Residency Requirement | Period required for naturalization eligibility. |
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