perturbation (English)
Where does "perturbation" come from?
The English noun 'perturbation' entered the language as a borrowing from Middle French 'perturbation'[1]. This Middle French form developed from Old French 'perturbacion'[1], which in turn came from the Latin noun 'perturbatio'[1]. The Latin root 'perturbatio' is formed from 'perturbō' and the suffix '-tiō'[2]. 'Perturbō' combines the prefix 'per-' with 'turbō', meaning to agitate or disturb[3]. The verb 'turbō' derives from 'turba'[4], which is likely borrowed from Ancient Greek 'τύρβη' meaning tumult or disorder[5]. Ultimately, the Greek term traces back to the Proto-Indo-European root '*(s)twerH-', meaning to rotate or swirl[5].
Open questions
- The derivation of the Latin noun turba from Ancient Greek türbë is considered probable rather than certain. [5]
- The ultimate origin of the Proto-Indo-European root *(s)twerH- is a reconstructed form. [5]
Full etymology tree
- perturbation (English), 'Agitation; the state of being perturbed.'
- borrowed perturbation (Middle French)
- inherited perturbacion (Old French)
- inherited perturbatio (Latin), 'confusion'
- derived perturbo (Latin), 'to confuse'
- prefix per- (Latin), 'Used to make adjectives or verbs that are "very" something.'
- derived turbo (Latin), 'tornado, whirlwind'
- derived turba (Latin), 'turmoil, disorder, stir, disturbance, tumult, uproar, hubbub, commotion, trouble, confusion, disarray, brawl'
- borrowed τύρβη (túrbē) (Ancient Greek), 'disorder, confusion, tumult'
- inherited *(s)twerH- (Proto-Indo-European), 'to stir up, agitate'
- borrowed τύρβη (túrbē) (Ancient Greek), 'disorder, confusion, tumult'
- derived turba (Latin), 'turmoil, disorder, stir, disturbance, tumult, uproar, hubbub, commotion, trouble, confusion, disarray, brawl'
- suffix -tio (Latin), '-tion, -ation, -ing; suffixed to verbs to form action nouns denoting a process, action, or result of an action.'
- derived perturbo (Latin), 'to confuse'
- inherited perturbatio (Latin), 'confusion'
- inherited perturbacion (Old French)
- borrowed perturbation (Middle French)
Ancestors
- perturbatio (Latin)
Descendants and derived words
- cosmological perturbation theory (English)
- perturbational (English)
- perturbation theory (English)
- photoperturbation (English)
- preperturbation (English)
- reperturbation (English)
- subperturbation (English)
Sources
- perturbation (English) - Wiktionary
- perturbatio (Latin) - Wiktionary
- perturbo (Latin) - Wiktionary
- turbo (Latin) - Wiktionary
- turba (Latin) - Wiktionary
Updated October 2026
Etymology data from Wiktionary, CC BY-SA 4.0 · About Miraris