Definition of ratio decidendi in English:

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ratio decidendi

Pronunciation: /ˌdɛsɪˈdɛndiː/

noun (plural rationes decidendi /ˌratɪˈəʊniːz/)

The rule of law on which a judicial decision is based.
Example sentences
  • Courts are bound by principles of law, the ratio decidendi of cases.
  • The former are described as being the ratio decidendi (reasons for the decision).
  • If property suddenly became available all over the country many of the rationes decidendi of the past would be quite inappropriate.


Latin, literally 'reason for deciding'.

For editors and proofreaders

Line breaks: ratio de¦ci|dendi

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