Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • transitive verb To state or express positively; affirm.
  • transitive verb To defend or maintain (one's rights, for example).
  • transitive verb To put into action boldly; employ or demonstrate.
  • idiom (assert oneself) To act boldly or forcefully, especially in defending one's rights or stating an opinion.

from The Century Dictionary.

  • To bring (into freedom); set (free).
  • To vindicate, maintain, or defend by words or measures; support the cause or claims of; vindicate a claim or title to: now used only of immaterial objects or reflexively: as, to assert our rights and liberties; he asserted himself boldly.
  • To state as true; affirm; asseverate; aver; declare.
  • Syn. 2. Assert, Defend, Maintain, Vindicate, Assert supports a cause or claim aggressively: its meaning is well brought out in the expression, assert yourself; that is, make your influence felt. To defend is primarily to drive back assaults. To maintain is to hold up to the full amount, defending from diminution: as, to maintain the ancient customs, liberties, rights. To vindicate is to rescue, as from diminution, dishonor, or censure: as, to “vindicate the ways of God to man,”
  • Assert, Affirm, Declare, Aver, Asseverate (see declare), allege, protest, avow, lay down. (See protest.) Assert seems to expect doubt or contradiction of what one says. Affirm strengthens a statement by resting it upon one's reputation for knowledge or veracity: as, “she constantly affirmed that it was even so,” Acts xii. 15. Declare makes public, clear, or emphatic, especially against contradiction. Aver is positive and peremptory. Asseverate is positive and solemn.

from the GNU version of the Collaborative International Dictionary of English.

  • transitive verb To affirm; to declare with assurance, or plainly and strongly; to state positively; to aver; to asseverate.
  • transitive verb Obs. or Archaic To maintain; to defend.
  • transitive verb To maintain or defend, as a cause or a claim, by words or measures; to vindicate a claim or title to.
  • transitive verb to claim or vindicate one's rights or position; to demand recognition.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun computer science an assert statement; a section of source code which tests whether an expected condition is true.
  • verb To declare with assurance or plainly and strongly; to state positively.
  • verb To use or exercise and thereby prove the existence of.
  • verb To maintain or defend, as a cause or a claim, by words or measures; to vindicate a claim or title to; as, to assert our rights and liberties.
  • verb computer science to make true; to make equal to 1.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • verb assert to be true
  • verb state categorically
  • verb to declare or affirm solemnly and formally as true
  • verb insist on having one's opinions and rights recognized

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

Latin asserere, assert- : ad-, ad- + serere, to join.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin assertus, perfect passive participle of asserō ("declare someone free or a slave by laying hands upon him; hence free from, protect, defend; lay claim to, assert, declare"), from ad ("to") + serō ("join, range in a row").

Examples

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