Ba·ha’i (bä-hä??, b?-h??)adj. Of or relating to a religion founded in 1863 in Persia and emphasizing the spiritual unity of all humankind.n. A teacher of or a believer in this faith.[Persian bah?’?, a follower of Bah?’ull?h, the Splendor of God, Bahaullah, from bah?’, splendor, from Arabic; see bhw in Semitic roots.]Ba·ha?ism (b?-hä??z??m, -h??-) n.Ba·ha?ist n.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.