Definition of res ipsa loquitur in US English:

res ipsa loquitur


  • The principle that the occurrence of an accident implies negligence.

    • ‘A claim of res ipsa loquitur will usually not succeed, or indeed be necessary, if there is any actual evidence about how the loss or injury was sustained.’
    • ‘Res ipsa loquitur does not excuse the finder of fact from determining "how the specific negligence occurred".’
    • ‘As to causation, the Judge decided that the maxim ‘res ipsa loquitur’ applied.’


Latin, literally ‘the matter speaks for itself’.


res ipsa loquitur