Etymology
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self-assurance (n.)

"feeling of confidence and security as to oneself," 1590s, from self- + assurance.

updated on April 16, 2022

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Definitions of self-assurance from WordNet

self-assurance (n.)
freedom from doubt; belief in yourself and your abilities;
Synonyms: assurance / confidence / self-confidence / authority / sureness
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.