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Etymology

The word "Baháʼí" (بهائی) is used either as an adjective to refer to the Baháʼí Faith or as a term for a follower of Baháʼu'lláh. The proper name of the religion is the "Baháʼí Faith", not Baháʼí or Baha'ism (the latter, once common among academics, is regarded as derogatory by the Baháʼís). It is derived from the Arabic "Baháʼ" (بهاء), a name Baháʼu'lláh chose for himself, referring to the 'glory' or 'splendor' of God. In English, the word is commonly pronounced bə- HYE (/ b ə ˈ h aɪ /), but the more accurate rendering of the Arabic is bə- HAH -ee (/ b ə ˈ h ɑː. iː /).

The accent marks above the letters, representing long vowels, derive from a system of transliterating Arabic and Persian script that was adopted by Baháʼís in 1923, and which has been used in almost all Baháʼí publications since. Baháʼís prefer the orthographies Baháʼí, the Báb, Baháʼu'lláh, and ʻAbdu'l-Bahá. When accent marks are unavailable, Bahai, Bahaʼi, or Bahaullah are often used.