[op.er.ant] adj (15c) 1: functioning or tending to produce effects: effective "an ~ conscience"
2: of or relating to the observable or measurable
3: of, relating to, or being an operant or operant conditioning "~ behavior" -- op.er.ant.ly adv
[2]operant n (1937): behavior (as bar pressing by a rat to obtain food) that operates on the environment to produce rewarding and reinforcing effects