Definitions from Wiktionary (perturb)

▸ verb:  To disturb; to bother or unsettle.
▸ verb:  (physics) To slightly modify the motion of an object.
▸ verb:  (astronomy) To modify the motion of a body by exerting a gravitational force.
▸ verb:  (mathematics) To modify slightly, such as an equation or value.
▸ Also see perturb

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