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ratio cognoscendi
noun
ra·tio cog·no·scen·di
\ˈrätēˌōˌkȯgnəˈsken(ˌ)dē\
Definition of ratio cognoscendi
rationes cognoscendi
\ˌrätēˈō(ˌ)nāˌskȯg-\: the ground of knowledge : something through or by means of which a thing is known
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Origin and Etymology of ratio cognoscendi
Latin
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