adj.consisting of or involving a single element or component

"in a unary operation in a mathematical system one element is used to yield a single result"

Unary Positional Computing
UNARY LANGUAGE OPERATIONS, STATE COMPLEXITY AND JACOBSTHAL'S FUNCTION
Optimal Simulations Between Unary Automata
Performance of unary bulk IO operations on virtual disks by interleaving
Distributive lattices with an additional unary operation
First-order logic with two variables and unary temporal logic
Polynomial-Time Implication Problems for Unary Inclusion Dependencies
Errata to: “Finite Automata and Unary Languages” : [Theoret. Comput. Sci. 47 (1986) 149–158]
The unsolvability of the equivalence problem for e-free NGSM's with unary input (output) alphabet and applications
The unsolvability of the equivalence problem for e-free NGSM's with unary input (output) alphabet and applications