perturbation

The act of perturbing.

The state of being perturbed; agitation.

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.

The act of perturbing, or the state of being perturbed; disturbance; disorder; especially, disquiet of mind; restlessness or want of tranquillity of mind; commotion of the passions.

Variation; especially, irregular or violent variation.