Meaning

noun something (as property) held by one party (the trustee) for the benefit of another (the beneficiary)

noun certainty based on past experience

noun the trait of believing in the honesty and reliability of others

originFrom Middle English trust, trost (“trust, protection”). Long considered a borrowing from Old Norse traust (“confidence, help, protection”), from Proto-Germanic *traustą, but the root vocalism is incompatible, so trust has come to be considered a reflex of an unattested Old English *trust, from a rare zero-grade Proto-Germanic variant of the same root also attested in Middle High German getrüste…

Etymology from Wiktionary, CC BY-SA 3.0