0 a member of a Christian Church that does not believe in the Trinity (= the existence of one God in three forms, the Father, the Son, and the Holy Spirit):
The conference was a great opportunity to get together with other Unitarians.
1 belonging or relating to a Christian Church that does not believe in the Trinity (= the existence of one God in three forms, the Father, the Son, and the Holy Spirit ):
Holt comes from five generations of Unitarians.
Jefferson thought most Americans would become rationalist Unitarians within a generation or two.
His detractors labelled Lindsey and his followers Unitarians because the Trinity was nowhere to be found in the Christian religion they distilled from the Bible.
The meeting took place in Des Moines's First Unitarian Church.
Their progressive Unitarian beliefs kept them from being fully assimilated within their genteel London circle.
