Definitions for operantˈɒp ər ənt
Random House Webster's College Dictionary
op•er•antˈɒp ər ənt(adj.)
operating; producing effects.
(n.)a person or thing that operates.
Origin of operant:
1595–1605; < LL
having influence or producing an effect
"many emotional determinants at work"; "an operant conscience"
An operative person or thing.
A class of behavior that produces consequences by operating (i.e., acting) upon the environment.
That operates to produce an effect.