Emily Dickinson Lexicon

AR-MY, n. [Fr. armée; Ir. arbhar. or armhar; from the common root of arm, armo, arma.]

1. A collection or body of men armed for war, and organized in companies, battalions, regiments, brigades and divisions, under proper officers. In general, an army in modern times consists of infantry and cavalry, with artillery; although the union of all is not essential to the constitution of an army. Among savages, armies are differently formed.
2. A great number; a vast multitude; as, an army of locusts or caterpillars. Joel ii. 25.