A member of a certain political movement, especially the Unitarios in 19th C. Argentina, known as the Unitarian Party in English
A follower of Unitarian Universalism; or to distinguish a member of a Unitarian Universalist Church in North America who adhered to, or identifies with, the Unitarian part of that church prior to merger in 1961
{i} one who adheres to Unitarian Universalism; monotheist who is not a Christian; Christian who believes that God is one being, Christian who rejects Trinitarianism