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