Meaning ofassertionin English

Noun

1. a statement made with confidence; declaration
   The manager made a bold assertion about the company's future growth.
2. something declared or stated; a claim
   The politician's assertion that she would reduce taxes was met with skepticism.
3. an unsupported or unproven statement
   The scientist's assertion about the new species was based on incomplete data.
4. a programming check for a expected condition
   The programmer added an assertion to the code to check for null pointer exceptions.