Whiskeytown-Shasta-Trinity National Recreation Area: see National Parks and Monuments (table).

Trinity Sunday, first Sunday after Pentecost, observed as a feast of the Trinity. It was an innovation in medieval England and spread through the Western Church in the 14th cent. The Sundays until Advent are counted from either Pentecost or Trinity.

Trinity College, Ireland: see Dublin, Univ. of.

Trinity Bay, inlet of the Atlantic Ocean, 80 mi (129 km) long, SE Newfoundland, N.L., Canada, between the Avalon Peninsula and the mainland. With its small fishing settlements and canneries, it preserves the flavor of 19th cent. Newfoundland. Trinity, a small port on the west shore, was the western terminal of the first permanent transatlantic cable laid (1866) by Cyrus West Field.

Trinity, river rising in N Texas in three forks; the Clear Fork runs into the West Fork at Fort Worth, and the Elm Fork joins the West Fork at Dallas. The Trinity then flows c.510 mi (820 km) SE to Trinity Bay, an arm of Galveston Bay. The waters of upper tributaries and the main stream are impounded in numerous reservoirs that provide water for the Dallas-Fort Worth metropolitan area; flood control; and water for irrigation. The largest reservoir, Garza-Little Elm, is impounded by Lewisville Dam (completed 1955) on the Elm Fork. The Trinity valley has a greater population and the majority of industrial development as opposed to other river basins in Texas. Massive flooding of the river occurred in the spring of 1990, recorded as among the nation's worst floods in the 20th cent.

Trinity [Lat.,=threefoldness], fundamental doctrine in Christianity, by which God is considered as existing in three persons. While the doctrine is not explicitly taught in the New Testament, early Christian communities testified to a perception that Jesus was God in the flesh; the idea of the Trinity has been inferred from the Gospel of St. John. The developed doctrine of the Trinity purports that God exists in three coequal and coeternal elements—God the Father, God the Son, and God the Holy Spirit (see creed 1). It sees these "persons" as constituted by their mutual relations, yet does not mean that God in his essence is Father, or a male deity. Jesus spoke of a relation of mutual giving and love with the Father, which believers could also enjoy through the Spirit. The Trinity is commemorated liturgically in the Western Church on Trinity Sunday. For systems denying the Trinity, see Unitarianism.

In Christian doctrine, the unity of the Father, Son, and Holy Spirit as one God in three persons. The word Trinity does not appear in the Bible. It is a doctrine formulated in the early church to interpret the way God revealed himself, first to Israel, then in Jesus as Saviour, and finally as Holy Spirit, preserver of the church. The doctrine of the Trinity developed in the early centuries of the church and was explicitly stated at the Council of Nicaea in 325.

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Private liberal arts college in Hartford, Conn., founded in 1823. It is historically affiliated with the Episcopal church, though its curriculum is nonsectarian. Bachelor's degrees are granted in more than 30 different study areas, and graduate study is offered by several departments, including economics, English, and history. Trinity participates in a cooperative exchange program with 12 New England colleges and universities.

Learn more about Trinity College with a free trial on Britannica.com.

In Christian doctrine, the unity of the Father, Son, and Holy Spirit as one God in three persons. The word Trinity does not appear in the Bible. It is a doctrine formulated in the early church to interpret the way God revealed himself, first to Israel, then in Jesus as Saviour, and finally as Holy Spirit, preserver of the church. The doctrine of the Trinity developed in the early centuries of the church and was explicitly stated at the Council of Nicaea in 325.

Learn more about Trinity, Holy with a free trial on Britannica.com.