late 14c., a place-name traced to 521 C.E., of uncertain origin. Armenian is from 1590s as "a native of Armenia;" as the name of the Indo-European language spoken there, by 1718; as an adjective, by 1727.

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Definitions of Armenia from WordNet

Armenia (n.)
a landlocked republic in southwestern Asia; formerly an Asian soviet; modern Armenia is but a fragment of ancient Armenia which was one of the world's oldest civilizations; throughout 2500 years the Armenian people have been invaded and oppressed by their neighbors;
Synonyms: Republic of Armenia / Hayastan