TRINITY

n. state of being triple; group of three, triad

n. site of the first test detonation of the atomic bomb (in the desert of New Mexico in 1945)

In Christianity, Trinity is the doctrine that God is one being who exists, simultaneously and eternally, as a mutual indwelling of three persons (not to be confused by "person"): the Father, the Son (incarnate as Jesus of Nazareth), and the Holy Spirit. Since the 4th century, in both Eastern and Western Christianity, this doctrine has been stated as "three persons in one God," all three of whom, as distinct and co-eternal persons, are of one indivisible Divine essence, a simple being. The doctrine also teaches that the Son Himself has two distinct natures, one fully divine and the other fully human. Supporting the doctrine of the Trinity is known as Trinitarianism. The majority of Christians are Trinitarian, and regard belief in the Trinity as a test of Christian orthodoxy.
See more at Wikipedia.org...

Noun
1. the union of the Father and Son and Holy Ghost in one Godhead
(synonym) Holy Trinity, Blessed Trinity, Sacred Trinity
(hypernym) Godhead, Lord, Creator, Maker, Divine, God Almighty, Almighty, Jehovah
(member-meronym) hypostasis

Noun
1. the cardinal number that is the sum of one and one and one
(synonym) three, 3, III, trio, threesome, tierce, leash, troika, triad, trine, ternary, ternion, triplet, tercet, terzetto, trey, deuce-ace
(hypernym) digit, figure
2. three people considered as a unit
(synonym) trio, threesome, triad
(hypernym) gathering, assemblage
(hyponym) triumvirate

(n.)
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.
  

(n.)
Any union of three in one; three units treated as one; a triad, as the Hindu trinity, or Trimurti.
  

(n.)
Any symbol of the Trinity employed in Christian art, especially the triangle.
  

[Other] In Christian theology, the doctrine that God exists as three persons -- Father, Son, and Holy Spirit -- who are united in one substance or being. The doctrine is not taught explicitly in the New Testament, where the word God almost invariably refers to the Father; but already Jesus Christ, the Son, is seen as standing in a unique relation to the Father, while the Holy Spirit is also emerging as a distinct divine person.