An adjunct professor, also called an adjunct lecturer or adjunct instructor is a non-tenure position in the U.S. and Canada. They usually rank below a full professor. They are usually hired on a contract basis. They are often hired as part-time instructors especially at universities and colleges with tightening budgets. The position of an adjunct can often lead to a full-time professorship. It is also an opportunity for professionals to teach part-time.