BizTerm Definition
res ipsa loquitur
Full Definition

A Latin term meaning "the thing speaks for itself." Res ipsa loquitur is a legal doctrine or rule of evidence that creates a presumption that a defendant acted negligently simply because a harmful accident occurred. The presumption arises only if (1) the thing that caused the accident was under the defendant's control, (2) the accident could happen only as a result of a careless act and, (3) the plaintiff's behavior did not contribute to the accident. Lawyers often refer to this doctrine as "res ips" or "res ipsa."

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