B1
the place where people's official documents are checked when they enter a country at an airport, port, border, etc.
Dictionary examples:
At immigration, I accidentally showed my pizza loyalty card instead of passport. (0.0)
The immigration officer laughed when I said my job was 'professional pillow tester'. (0.0)
At immigration, I accidentally put my passport in the officer's coffee cup. (0.0)
immigration officers (25.6)
After you've been through immigration (control), you can go and get your luggage. (42.5)