Definition of ratio decidendi in English:

ratio decidendi

Line breaks: ratio de¦ci|dendi
Pronunciation: /ˌdɛsɪˈdɛndiː

noun (plural rationes decidendi /ˌratɪˈəʊniːz/)

  • The rule of law on which a judicial decision is based.
    More 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'.

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