assert vs quit

assert

verb
  • To maintain or defend, as a cause or a claim, by words or measures; to vindicate a claim or title to 

  • He would often assert that there was life on other planets. 

  • 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. 

  • To use or exercise and thereby prove the existence of. 

  • To set a signal on a line using a voltage or electric current. 

  • To specify that a condition or expression is true at a certain point in the code. 

  • To declare with assurance or plainly and strongly; to state positively. 

noun
  • an assertion; a section of source code which tests whether an expected condition is true. 

quit

verb
  • To release from obligation, accusation, penalty, etc.; to absolve; to acquit. 

  • To leave (a place). 

  • To stop, give up (an activity) (usually + gerund or verbal noun). 

  • To resign from (a job, office, position, etc.). 

  • To close (an application). 

  • To set at rest; to free, as from anything harmful or oppressive; to relieve; to clear; to liberate. 

  • To abandon, renounce (a thing). 

noun
  • Any of numerous species of small passerine birds native to tropical America. 

adj
  • Released from obligation, penalty, etc; free, clear, or rid. 

How often have the words assert and quit occurred in a corpus of books? (source: Google Ngram Viewer )