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Etymology: L, per + tubare, to disturb
a cause or a condition of disturbance, disorder, or confusion.


In physical therapy, an external force applied to a person's center of mass in an attempt to move it from the base of support


(pĕr″tĕr-bā′shŭn) [L. perturbare, thoroughly disordered]
1. The state of being greatly disturbed or agitated; uneasiness of mind.
2. A disturbance or a change in a structure or function, usually as a result of an external influence.


n a small disturbance that tips a metastable system over into disorder and chaos.
References in periodicals archive ?
Thus, we begin with the assumption that a putative anomalous force would give rise to a perturbational interaction, by which we mean that, given an ensemble of entities (e.
Their behavior follows well understood analysis and is relatively unfettered compared to perturbational cavity techniques.

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