confirm

The story

1. Latin · derived fromcōnfirmāre“to make firm, strengthen, establish”
2. Old French · derived fromconfermer
3. Middle English · inherited fromconfirmen
4. English todayconfirm

From Middle English confirmen, confermen, from Old French confermer, from Latin cōnfirmāre (“to make firm, strengthen, establish”), from con- (“together”) + firmāre (“to make firm”), from firmus (“firm”).