Plural of 'certum' (a medieval Latin term), sometimes used in historical or legal documents to refer to certainties or established facts.
From Latin 'certus' (certain, definite), the root word for 'certificate,' 'certify,' and 'certitude.' This form is primarily historical and scholarly.
Medieval scholars debated 'certis et incertis'—the certain and uncertain things—when discussing epistemology and knowledge, showing how Roman legal and philosophical vocabulary shaped how educated people thought about truth.
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