acquit (v.)

early 13c., "to satisfy a debt" (either for oneself or on behalf of another), from Old French aquiter, acquiter "pay, pay up, settle a claim" (12c., Modern French acquitter), from a- "to" (see ad-) + quite "free, clear," from Medieval Latin quitus, quittus, from Latin quietus "free" (in Medieval Latin "free from war, debts, etc."), also "calm, resting" (from PIE root *kweie- "to rest, be quiet"). Meanings "set free from charges" and "discharge one's duty" both recorded from late 14c. Related: Acquitted; acquitting.