V. S. Apte, The Practical Sanskrit–English Dictionary. Look up any word of the Gita in Devanagari, IAST or Harvard-Kyoto, or browse the headwords letter by letter.
Entry पृतना
पृतनाpṛtanā1 An army (in general).
1 An army (in general).
A division of an army consisting of 243 elephants, as many chariots, 729 horse, and 1215 foot; see अक्षौहिणी.