Political doctrine advocating the recovery of territories considered historically or ethnically related. Often used in geopolitical contexts.
See also: 民族統一主義
Irredentism often causes international conflicts.
その政党は領土回復主義を掲げて支持を集めた。
That political party gained support by advocating irredentism.
民族統一主義 emphasizes ethnic unification across borders, while 領土回復主義 focuses specifically on reclaiming lost territory.
Compound of 領土 (territory), 回復 (recovery), and 主義 (doctrine). The term is a direct translation of the English 'irredentism'.