n. A native soldier of the East Indies, employed in the service of a European colonial power, notably the British India army (first under the British-chartered East India Company, later in the crown colony), but also France and Portugal.
the GNU version of the Collaborative International Dictionary of English
n. A native of India employed as a soldier in the service of a European power, esp. of Great Britain; an Oriental soldier disciplined in the European manner.
The Century Dictionary and Cyclopedia
n. In India, a native soldier disciplined and uniformed according to European regulations; especially, a native soldier of the British army in India. The officers of sepoys have usually been European, and those of the higher ranks are exclusively so.
Word Usage
"Like his mother, he has positioned himself as a "sepoy" of the poor, untouchables and tribals, as he himself tells it."