say it: pur-tur-BAY-shuhn
perturbation is a noun meaning "an unhappy and worried mental state". It carries 5 recorded senses.
an unhappy and worried mental state
“there was too much anger and disturbance”
“she didn't realize the upset she caused me”
(physics) a secondary influence on a system that causes it to deviate slightly
physics
activity that is a malfunction, intrusion, or interruption
“the term `distress' connotes some degree of perturbation and emotional upset”
“he looked around for the source of the disturbance”
“there was a disturbance of neural function”
a disposition that is confused or nervous and upset
the act of causing disorder
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for perturbation come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.