[noun] [U] [formal]She displayed signs of increasing perturbation (= worry) as she hurried to meet him.(specialized) A perturbation is also a small change in the regular motion of an object.Perturbations in the orbit of the planet Uranus led to the discovery of Neptune in 1846.
PERTURBATION
Meaning of PERTURBATION in English
Cambridge English vocab. Кембриджский английский словарь. 2012