Definition of irredentism in US English:

irredentism

noun

  • 1A policy of advocating the restoration to a country of any territory formerly belonging to it.

    1. 1.1historical (in 19th-century Italian politics) a policy of advocating the return to Italy of all Italian-speaking districts subject to other countries.

Origin

Late 19th century: from irredentist + -ism.

Pronunciation

irredentism

/ˌi(r)rəˈdenˌtizəm//ˌɪ(r)rəˈdɛnˌtɪzəm/