late 13c., "mental distress, emotional disorder of the mind, grief," from Old French destorbance (12c., Old North French distorbance), from destourber, from Latin disturbare "throw into disorder," from dis- "completely" (see dis-) + turbare "to disorder, disturb," from turba "turmoil" (see turbid).
Meaning "public disturbance, political agitation" is from c. 1300; that of "violent interruption of peace or unity" is late 14c.; it is the sense in disturbance of the (king's) peace," early 15c.
"emaciation as a result of severe emotional disturbance," coined 1873 by William W. Gull, who also offered as an alternative apepsia hysterica as a name for it. See anorexia.
late 14c., "violent movement or agitation, emotional disturbance," from Old French commocion "violent motion, agitation" (12c., Modern French commotion) and directly from Latin commotionem (nominative commotio) "violent motion, agitation," noun of action from past participle stem of commovere "to move, disturb," from com "with, together," perhaps here "thoroughly" (see com-) + movere "to move" (from PIE root *meue- "to push away").
From mid-15c. as "public unrest or disturbance." Verbs commote "to disturb, stir up" (1852), commove (late 14c.) are marked "rare" in Century Dictionary.
late 14c., perturbacioun, "mental disturbance, state of being perturbed," from Old French perturbacion "disturbance, confusion" (14c.) and directly from Latin perturbationem (nominative perturbatio) "confusion, disorder, disturbance," noun of action from past participle stem of perturbare (see perturb).
1520s, "lack of regular arrangement;" 1530s, "tumult, disturbance of the peace;" from disorder (v.). Meaning "an ailment, a disturbance of the body or mind" is by 1704.
1737, "disturbance of regular order," from French dérangement (17c.), from déranger (see derange). Mental sense "disturbance of the intellect or reason" is from 1800.