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tr.v. as·sert·ed, as·sert·ing, as·serts
1. To state or express positively; affirm: asserted his innocence.
2. To defend or maintain (one's rights, for example).
3. To put into action boldly; employ or demonstrate: asserted her independence.
assert oneself
To act boldly or forcefully, especially in defending one's rights or stating an opinion.

[Latin asserere, assert- : ad-, ad- + serere, to join; see ser- in Indo-European roots.]

as·sert′a·ble, as·sert′i·ble adj.
as·sert′er, as·ser′tor n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
Brandom (1983: 649, note 12) on the idea of a world assertor.
That champion of English Architecture treated the assertor of the superior beauty and antiquity of the French churches with all the national pride and high disdain of a hero of chivalry; but not with triumphant success, except in his own heated imagination.
One can persuade an assertor by referring to objectives and results--detail main points only, be assertive in your communication and body language and finally be well organized.
(30) On Liberalis' role as assertor, see Jones (note 4) 23.
These lines thus introduce the next major section of the letter, roughly 35 lines, which richly describe the dog as both the companion and protector of the poet in his rustic solitude and thereby as the very guarantor of his freedom: "Liber ago; meus assertor michi scilicet unus / est, comes assiduus" (31-32; "I live freely, / since he and he alone is my protector, / And my constant companion"; translation modified).