noun Date: 14th century the action of perturbing ; the state of being perturbed, a disturbance of motion, course, arrangement, or state of equilibrium, ~al adjective
PERTURBATION
Meaning of PERTURBATION in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012