unitary

Short definition from Wiktionary

Adjective

1. 1
   Having the quality of oneness.
2. 2
   That concentrates power in a single body, rather than sharing it with more local bodies.
3. 3
   That contains an identity element.
4. 4
   Whose inverse is equal to its adjoint.

Noun

1. 1
   A unitary council.
2. 2
   A unitary matrix or operator.