Late Middle English; earliest use found in John Lydgate (c1370–c1449), poet and prior of Hatfield Regis. From classical Latin perturbant-, perturbāns, present participle of perturbāre: see -ance.
Definition of perturbance in US English:
perturbance
nounpəˈtəːb(ə)ns
Perturbation.
Origin
Late Middle English; earliest use found in John Lydgate (c1370–c1449), poet and prior of Hatfield Regis. From classical Latin perturbant-, perturbāns, present participle of perturbāre: see -ance.