geographical name Mon·a·ghan \ˈmä-nə-hən, -ˌhan\

Definition of Monaghan

  1. 1 county of the northeastern part of the republic of Ireland bordering on Northern Ireland; in Ulster area 498 square miles (1290 square kilometers), population 60,483

  2. 2 town and capital of the county of Monaghan area population 7452

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