An Etymological Dictionary of Astronomy and Astrophysics
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Of or relating to a community; communal.

→ community; → -ary.

1) Of or pertaining to a unit or units; having the indivisible character of a unit.
2) Math.: An → operator  U satisfying the relations: U⁺ U = 1, U U⁺ = 1, where U⁺ is the → adjoint .

→ unit + -ary.

The set of n × n unitary matrices (→ unitary matrix).

→ unitary; → group.

A square matrix whose inverse equals its adjoint.

→ unitary; → matrix.

A linear operator whose inverse is its → adjoint. In addition to → Hermitian operators, unitary operators constitute a fundamentally important class of quantum-mechanical operators.

→ unitary; → operator.

A transformation whose reciprocal is equal to its Hermitian conjugate.

→ unitary; → transformation.