Etymology
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confidence (n.)

c. 1400, "assurance or belief in the good will, veracity, etc. of another," from Old French confidence or directly from Latin confidentia, from confidentem (nominative confidens) "firmly trusting, bold," present participle of confidere "to have full trust or reliance," from assimilated form of com, here perhaps an intensive prefix (see com-), + fidere "to trust" (from PIE root *bheidh- "to trust, confide, persuade").

From mid-15c. as "reliance on one's own powers, resources, or circumstances, self-assurance." Meaning "certainty of a proposition or assertion, sureness with regard to a fact" is from 1550s. Meaning "a secret, a private communication" is from 1590s. The connection with swindling (see con (adj.)) dates to mid-19c. and comes from the notion of the false "trustworthiness" which is the key to the game.

Origin and meaning of confidence

updated on October 13, 2021

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Definitions of confidence from WordNet

confidence (n.)
freedom from doubt; belief in yourself and your abilities;
after that failure he lost his confidence
confidence (n.)
a feeling of trust (in someone or something);
confidence is always borrowed, never owned
I have confidence in our team
confidence (n.)
a state of confident hopefulness that events will be favorable;
public confidence in the economy
confidence (n.)
a trustful relationship;
he took me into his confidence
Synonyms: trust
confidence (n.)
a secret that is confided or entrusted to another;
the priest could not reveal her confidences
everyone trusted him with their confidences
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.