as·sert

[uh-surt]
verb (used with object)
1.
to state with assurance, confidence, or force; state strongly or positively; affirm; aver: He asserted his innocence of the crime.
2.
to maintain or defend (claims, rights, etc.).
3.
to state as having existence; affirm; postulate: to assert a first cause as necessary.
4.
assert oneself, to insist on one's rights, declare one's views forcefully, etc.: The candidate finally asserted himself about property taxes.

Origin:
1595–1605; < Latin assertus joined to, defended, claimed (past participle of asserere), equivalent to as- as- + ser- (see series) + -tus past participle suffix

as·sert·er, as·ser·tor, noun
as·sert·i·ble, adjective
mis·as·sert, verb (used with object)
o·ver·as·sert, verb (used with object)
pre·as·sert, verb (used with object)
re·as·sert, verb (used with object)


1. asseverate, avow, maintain. See declare. 2. uphold, support. See maintain.


1. deny.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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to steal or take dishonestly (money, esp. public funds, or property entrusted to one's care); embezzle.
Collins
World English Dictionary
assert (əˈsɜːt) [Click for IPA pronunciation guide]
 
vb
1.  to insist upon (rights, claims, etc)
2.  (may take a clause as object) to state to be true; declare categorically
3.  to put (oneself) forward in an insistent manner
 
[C17: from Latin asserere to join to oneself, from serere to join]
 
as'serter
 
n
 
as'sertor
 
n
 
as'sertible
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

assert
c.1600, "to declare," from L. assertus, pp. of asserere "to claim, maintain, affirm" (see assertion). To assert oneself "stand up for one's rights" is recorded from 1879.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Some assert that merely bolstering campus security misses the point.
Between the ages of six months and a year, a child's natural preference begins
  to assert itself.
There are those who assert that the sense of smell in a cat is not highly
  developed.
Yet, it will not be as potent if the attorney is diligent in asserting his
  client's defenses and objections.
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