Any of various political parties formed from or representing a union of two or more parties, factions, ideals, etc.; specifically one formed of Roman Catholic and Protestant moderates in Northern Ireland in 1970.
Origin
1920s.
Definition of Alliance Party in US English:
Alliance Party
noun
Any of various political parties formed from or representing a union of two or more parties, factions, ideals, etc.; specifically one formed of Roman Catholic and Protestant moderates in Northern Ireland in 1970.