dual nationality
He kept his British passport when he moved and now holds dual citizenship.
Dual citizenship (also known as dual nationality) in the UK means you can be a British citizen as well as a citizen of another country.
I need to apply for dual citizenship for my children.
Not all countries allow dual citizenship.
His daughter was born here and has dual citizenship.
He qualifies for dual citizenship because his grandparents were born here.

SMART Vocabulary: related words and phrases

Countries, nationalities & continents: country & nation
birthright citizenship
body politic
BRICS
citizen
compatriot
cross-border
cross-national
denaturalize
domestic
dual
fatherland
internationalism
native
non-country
non-domestic
non-indigenous
non-national
noncitizen
statehood
stateless