policy: English has two distinct and completely unrelated words policy. The one meaning ‘plan of action’ [14] comes via Old French policie from Latin polītīa ‘civil administration’, source also of English police and the now archaic polity [16]. This in turn came from Greek polīteíā, a derivative of pólis ‘city’ (source of English politics).
But the insurance policy [16] comes via French police ‘document’ and Provençal polissa from medieval Latin apodissa, an alteration of Latin apodīxis ‘proof, demonstration’, which in turn was acquired from Greek apódeixis, a compound noun derived ultimately from the verb deiknúnai ‘show’. => politics; diction[policy etymology, policy origin, 英语词源]