irredenta

[ir-i-den-tuh]
noun
  1. a region that is under the political jurisdiction of one nation but is related to another by reason of cultural, historical, and ethnic ties.

Origin of irredenta

1910–15; < Italian (Italia) irredenta (Italy) unredeemed; see irredentist
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018