SINCE 1828
ratio decidendi
noun
ra·tio de·ci·den·di
| \ ˈrā-shē-ˌō-ˌde-sə-ˈden-ˌdī, ˈrā-ˌshō-, -ˌdā-sē-ˈden-dē\
Legal Definition of ratio decidendi
: the principle or rule constituting the basis of a court decision
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