P0213000 (pûr′tər-bā′shən)n.1. a. The act of perturbing.b. The state of being perturbed; agitation.2. A small change in a physical system, such as a variation in a planet's orbit resulting from the gravitational influence of other celestial bodies.per′tur·ba′tion·al adj.
perturbational
(ˌpɜːtəˈbeɪʃənəl) adjrelating to perturbation EncyclopediaSeeperturbationLegalSeePerturbation