Dictionary![]() ![]() Ros•com•monPronunciation: (ros-kom'un), [key] —n. a county in Connacht, in the N Republic of Ireland. 54,499; 950 sq. mi. (2460 sq. km). Co. seat: Roscommon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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