Noah Webster's Dictionary 1. (n.) Pertaining to a sect, or to sects; peculiar to a sect; bigotedly attached to the tenets and interests of a denomination; as, sectarian principles or prejudices. 2. (n.) One of a sect; a member or adherent of a special school, denomination, or religious or philosophical party; one of a party in religion which has separated itself from established church, or which holds tenets different from those of the prevailing denomination in a state.

Multi-Version Concordance Sectarian (1 Occurrence) Titus 3:10 A sectarian man, after a first and second admonition be rejecting, (YLT)