a change in the normal state or regular movement of something. : the state of
being worried or upset. Source: Merriam-Webster's Learner's
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.
anxiety; mental uneasiness, a deviation of a system, movi... Meaning,
pronunciation, example sentences, and more from Oxford
per•tur•ba•tion USA pronunciation n. the act of perturbing. the state of being