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Webster 1828 Edition

Noun.

[anti and trinitarian, which see.]

One who denies the trinity or the existence of three persons in the Godhead.

Adj.

Opposing the trinity.

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; nontrinitarian.

rejecting the doctrine that God subsists as three distinct persons

antitrinitarian ‎(plural antitrinitarians)

one who rejects the Trinitarian doctrine