Etymology
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self-confidence (n.)

"confidence of one's own judgment or ability, reliance on one's own powers without other aid," 1650s, a back-formation from self-confident, or else from self- + confidence.

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Definitions of self-confidence

self-confidence (n.)
freedom from doubt; belief in yourself and your abilities;
Synonyms: assurance / self-assurance / confidence / authority / sureness
From wordnet.princeton.edu