Definition of "perturb"

perturb

/pɚˈtɝb/

verb
third-person singular simple present perturbs, present participle perturbing, simple past and past participle perturbed
1. To disturb; to bother or unsettle.
2. (physics) To slightly modify the motion of an object.
3. (astronomy) To modify the motion of a body by exerting a gravitational force.
4. (mathematics) To modify slightly, such as an equation or value.