Etymology
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trust (n.)

c. 1200, "reliance on the veracity, integrity, or other virtues of someone or something; religious faith," from Old Norse traust "help, confidence, protection, support," from Proto-Germanic abstract noun *traustam (source also of Old Frisian trast, Dutch troost "comfort, consolation," Old High German trost "trust, fidelity," German Trost "comfort, consolation," Gothic trausti "agreement, alliance"), from Proto-Germanic *treuwaz, source of Old English treowian "to believe, trust," and treowe "faithful, trusty," from PIE root *deru- "be firm, solid, steadfast."

from c. 1300 as "reliability, trustworthiness; trustiness, fidelity, faithfulness;" from late 14c. as "confident expectation" and "that on which one relies." From early 15c. in legal sense of "confidence placed in a one who holds or enjoys the use of property entrusted to him by its legal owner;" mid-15c. as "condition of being legally entrusted." Meaning "businesses organized to reduce competition" is recorded from 1877. Trust-buster is recorded from 1903.

trust (v.)

c. 1200, from Old Norse treysta "to trust, rely on, make strong and safe," from traust (see trust (n.)). Related: Trusted; trusting.

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Definitions of trust
1
trust (v.)
have confidence or faith in;
We can trust in our government
trust (v.)
allow without fear;
trust (v.)
be confident about something;
Synonyms: believe
trust (v.)
expect and wish;
I trust you will behave better from now on
Synonyms: hope / desire
trust (v.)
confer a trust upon;
Synonyms: entrust / intrust / confide / commit
trust (v.)
(chiefly archaic) extend credit to; "don't trust my ex-wife; I won't pay her debts anymore";
2
trust (n.)
something (as property) held by one party (the trustee) for the benefit of another (the beneficiary);
he is the beneficiary of a generous trust set up by his father
trust (n.)
certainty based on past experience;
he put more trust in his own two legs than in the gun
Synonyms: reliance
trust (n.)
the trait of believing in the honesty and reliability of others;
the experience destroyed his trust and personal dignity
Synonyms: trustingness / trustfulness
trust (n.)
a consortium of independent organizations formed to limit competition by controlling the production and distribution of a product or service;
they set up the trust in the hope of gaining a monopoly
Synonyms: corporate trust / combine / cartel
trust (n.)
complete confidence in a person or plan etc;
the doctor-patient relationship is based on trust
Synonyms: faith
trust (n.)
a trustful relationship;
he betrayed their trust
Synonyms: confidence
From wordnet.princeton.edu