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From Biology-Online Dictionary | Biology-Online Dictionary
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1. The union of three persons (the father, the Son, and the holy ghost) in one Godhead, so that all the three are one god as to substance, but three persons as to individuality.

2. Any union of three in one; three units treated as one; a triad, as the Hindoo trinity, or trimurti.

3. Any symbol of the Trinity employed in Christian art, especially the triangle. Trinity house, an institution in london for promoting commerce and navigation, by licensing pilots, ordering and erecting beacons, and the like. Trinity Sunday, the Sunday next after whitsunday; so called from the feast held on that day in honor of the holy Trinity. Trinity term.

See the note under term.

Origin: OE. Trinitee, F. Trinite, L. Trinitas, fr. Trini three each. See Trinal.