Definition: JAIN: A Hindu sect that worships Vishnu, a spiritual god, as its supreme deity. DEFINITION: Jainism is a religion that focuses on ascetic practices to attain spiritual perfection by purifying one's body, mind, and spirit through discipline and renunciation of sinful behavior. It rejects belief in physical gods, seeks material wealth for happiness, and believes in achieving eternal life by mastering the secrets of yoga or meditation.