1
Stage 1 of 3
certus
Latin · ancient
"determined, settled"
determined, settled, from cernere (to sift, to determine)
2
Stage 2 of 3
certain
Old French · medieval
"known for sure"
carried into French for something known for sure
3
Stage 3 of 3
certain
English · 1300s
"known without doubt, sure"
settled as the English word for something known without doubt
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