Ulster

noun
1.
a former province in Ireland, now comprising Northern Ireland and a part of the Republic of Ireland.
2.
a province in N Republic of Ireland. 3123 sq. mi. (8090 sq. km).
3.
Informal. Northern Ireland.
4.
(lowercase) a long, loose, heavy overcoat, originally of Irish frieze, now also of any of various other woolen cloths.
noun
1.
a man’s heavy double-breasted overcoat with a belt or half-belt at the back
noun
1.
a province and former kingdom of N Ireland: passed to the English Crown in 1461; confiscated land given to English and Scottish Protestant settlers in the 17th century, giving rise to serious long-term conflict; partitioned in 1921, six counties forming Northern Ireland and three counties joining the Republic of Ireland. Pop (three Ulster counties of the Republic of Ireland): 46 714 (2002); (six Ulster counties of Northern Ireland): 1 702 628 (2003 est). Area (Republic of Ireland): 8013 sq km (3094 sq miles); (Northern Ireland): 14 121 sq km (5452 sq miles)
2.
an informal name for Northern Ireland

Ulster definition

A historic division of Ireland, located in the northeastern part of the island. Six of its nine counties are in Northern Ireland. (See Republic of Ireland.)