| Noun | 1. | perturbation - an unhappy and worried mental state; "there was too much anger and disturbance"; "she didn't realize the upset she caused me"agitation - a mental state of extreme emotional disturbance | |
| 2. | perturbation - (physics) a secondary influence on a system that causes it to deviate slightlyinfluence - the effect of one thing (or person) on another; "the influence of mechanical action" variation - (astronomy) any perturbation of the mean motion or orbit of a planet or satellite (especially a perturbation of the earth's moon) | |
| 3. | perturbation - activity that is an intrusion or interruption; "he looked around for the source of the disturbance"; "there was a disturbance of neural function"activity - any specific activity; "they avoided all recreational activity" bother, hassle, trouble, fuss - an angry disturbance; "he didn't want to make a fuss"; "they had labor trouble"; "a spot of bother" magnetic storm - a sudden disturbance of the earth's magnetic field; caused by emission of particles from the sun | |
| 4. | perturbation - a disposition that is confused or nervous and upsetdiscomposure - a temperament that is perturbed and lacking in composure | |
| 5. | perturbation - the act of causing disorderdisturbance - the act of disturbing something or someone; setting something in motion breakdown, dislocation - the act of disrupting an established order so it fails to continue; "the social dislocations resulting from government policies"; "his warning came after the breakdown of talks in London" | |