Definition of unitarian
unitarianadjective, often capitalized
unitarianismplay \ˌyü-nə-ˈter-ē-ə-ˌni-zəm\ noun, often capitalized
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Unitarianism, originally a sect of Christianity believing in a single or unitary God, grew up in 18th-century England and developed in America in the early 19th century. Though they believe in Christ's teaching, they reject the idea of the three-part Trinity—God as father, son, and holy spirit—and thus deny that Christ was divine, so some people don't consider them truly Christian. In this century the Unitarians joined with the Universalist Church, a movement founded on a belief in universal salvation—that is, the saving of every soul from damnation after death. Both have always been liberal and fairly small; today they count about half a million members. Without a capital letter, unitarian refers simply to belief in a unitary God, or in unity within some nonreligious system.
Origin and Etymology of unitarian
New Latin unitarius, from Latin unitas unity
First Known Use: circa 1651
Learn More about unitarian
Britannica English: Translation of unitarian for Arabic speakers
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