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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.


relating to perturbation
References in periodicals archive ?
Therefore, as can be proved by elementary perturbational arguments, the possible additional level is shifted slightly above (not below) the dissociation limit, thus becoming a scattering state.
Role of the dorsal premotor cortex in rhythmic auditory-motor entrainment: A perturbational approach by rTMS.
Central chapters cover postulates of quantum mechanics, the Schr|dinger wave equation, stationary states, exact solutions, perturbational and variational methods, electron motion and correlation, and atomic structure.
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