Definition of "assert"

assert

/əˈsɜːt/

verb
third-person singular simple present asserts, present participle asserting, simple past and past participle asserted
1. To declare with assurance or plainly and strongly; to state positively.
  Quotations
  Numerous experimental tests and other observations have been offered in favor of animal mind reading, and although many scientists are skeptical, others assert that humans are not the only species capable of representing what others do and don’t perceive and know.
  2012 March-April, Colin Allen, “Do I See What You See?”, in American Scientist‎, volume 100, number 2, archived from the original on 26 April 2012, page 168
2. To use or exercise and thereby prove the existence of.
3. To maintain or defend, as a cause or a claim, by words or measures; to vindicate a claim or title to
4. (reflexive) To insist on the legitimacy of one's rights, opinion, etc; not to allow oneself to be dismissed; to ensure that one is taken into consideration; to make oneself respected; to be assertive.
5. (programming) To declare that a condition or expression must be true at a certain point in the source code (in some cases causing the program to fail if it is not, as a safeguard).
6. (electronics) To set a signal on a line using a voltage or electric current.
noun
plural asserts
1. (programming) Synonym of assertion