optant
noun 2
Definitions
noun
1
A person who lives in a region undergoing a change of sovereignty and thus may choose between retaining their old citizenship or opting for the citizenship of the new sovereignty.
According to one authority, nearly 40,000 of the Sleswick Danes had become 'optants'—that is, had taken the 'option' of Danish nationality—or had emigrated, by the end of 1880.
2
A person who opts into, out of, or for something.
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