Assertion

Assertion or assert may refer to:

Computing

 * Assertion (software development), a computer programming technique
 * assert.h, a header file in the standard library of the C programming language
 * Assertion definition language, a specification language providing a formal grammar to specify behaviour and interfaces for computer software

Logic and language

 * Logical assertion, a statement that asserts that a certain premise is true
 * Proof by assertion, an informal fallacy in which a proposition is repeatedly restated
 * Time of assertion, in linguistics a secondary temporal reference in establishing tense
 * Assertive, a speech act that commits a speaker to the truth of the expressed proposition

Other uses

 * Assert (horse) (1979–1995), an Irish racehorse
 * Assertions (auditing), the set of information that the statement preparer is providing in a financial statement audit