Entry 2 senses · 2 variants Webster, 1913 Jain /jīn/ · IPA /d͡ʒeɪn/ prop. n. adj. 01 prop. n. One of a numerous sect in British India, holding the tenets of Jainism. 1. One of a numerous sect in British India, holding the tenets of Jainism. 02 adj. of or pertaining to Jainism; as, Jain gods. 1. of or pertaining to Jainism; as, Jain gods. Syn. Jainist.