The Collaborative International Dictionary
Trinity \Trin"i*ty\, n. [OE. trinitee, F. trinit['e], L. trinitas, fr. trini three each. See Trinal.]
(Christian Theol.) 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.
Any union of three in one; three units treated as one; a triad, as the Hindu trinity, or Trimurti.
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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. (Law) See the Note under Term, n., 5.
Wikipedia
Trinity Sunday is the first Sunday after Pentecost in the Western Christian liturgical calendar, and the Sunday of Pentecost in Eastern Christianity. Trinity Sunday celebrates the Christian doctrine of the Trinity, the three Persons of God: the Father, the Son, and the Holy Spirit.
Usage examples of "trinity sunday".
Unexpectedly, in the middle of the service, and not in the usual order Natasha knew so well, the deacon brought out a small stool, the one he knelt on when praying on Trinity Sunday, and placed it before the doors of the sanctuary screen.
Come next Trinity Sunday, the twenty-fourth of May, the Year of Our Lord 1964, Master Walter would be celebrating his fiftieth anniversary of his appointment as Master Cabinetmaker to the Duke.
He lived to come home and make himself popular with the people and Parliament, and he died on Trinity Sunday, the eighth of June, one thousand three hundred and seventy-six, at forty-six years old.