1. antitrinitarian - Noun
2. antitrinitarian - Adjective
antitrinitarian (comparative more antitrinitarian, superlative most antitrinitarian)
(theology) Rejecting the Trinitarian doctrine that God subsists as three distinct Persons in the single substance of the Holy Trinity.
antitrinitarian (plural antitrinitarians)
(theology) One who rejects the doctrine (or dogma) of the Trinity, the Trinitarian doctrine.