What does "irredenta" mean?

Any region whose inhabitants are ethnically related to those of another state

Irredenta

Common synonyms include: case study, claimed lands, expansionism, expansionist, expansionist rhetoric, feminine form.

noun

noun ·Rare ·Advanced level

Noun

1
Any region whose inhabitants are ethnically related to those of another state
2
a region that is related ethnically or historically to one country but is controlled politically by another wordnet

From Italian irredenta (“unredeemed”).