Etymology
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assertiveness (n.)

"tendency toward self-assertion," 1867, short for self-assertiveness (1855); see assertive + -ness.

updated on February 23, 2017

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Definitions of assertiveness from WordNet

assertiveness (n.)
aggressive self-assurance; given to making bold assertions;
Synonyms: self-assertiveness
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.