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'Unitary' may refer to:

★ In Christian doctrine, 'unitarianism' is the belief in a "unitary God" as opposed to the concept of the Trinity.

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★ 'Unitarian Universalism' (sometimes called "Unitarianism") is an interfaith church which draws its name from an interfaith concept of "unitary God" (as opposed to an exclusively Christian concept).

★ Unitary state and Unitary authority - types of political regions.

★ Unitary enterprise

★ Promoters of Unitary Executive theory[1] call themselves "unitarians"

★ Unitary System
In 'mathematics', see

★ Unitary matrix

★ Unitary operator

★ Unitary transformation

★ Unitary group

★ Unitary representation

★ ''Note:''Some authors use the word "unitary" synonymously with unital, which for a module implies the underlying ring has multiplicative identity which acts as the identity on it, and for an algebra implies that the algebra itself has a mutliplicative identity.
For the role played by the mathematical concept of unitarity in 'physics', see

★ Unitarity (physics)