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https://en.wikipedia.org/wiki/Academic_tenure_in_North_America

Academic tenure in the United States and Canada is a contractual right that grants a teacher or professor a permanent position of employment at an academic institution such as a university or school. Tenure is intended to protect teachers from dismissal without just cause, and to allow development of thoughts or ideas considered unpopular or controversial among the community. In North America, tenure is granted only to educators whose work is considered to be exceptionally productive and beneficial in their careers.

Academic tenure became a standard for education institutions in North America with the introduction of the American Association of University Professors (AAUP)'s 1940 Statement of Principles on Academic Freedom and Tenure. In this statement, the AAUP provides a definition of academic tenure: "a means to certain ends, specifically: (1) freedom of teaching and research and of extramural activities, and (2) a sufficient degree of economic security to make the profession attractive to men and women of ability."

Academic tenure (colleges and universities)