- The definition of a prerequisite is something that must happen first, or that is a condition of something else occurring.
An example of a prerequisite is the requirement that you have money before you can buy something.
prerequisite definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
required beforehand, esp. as a necessary condition for something following
prerequisite definition by American Heritage Dictionary
Required or necessary as a prior condition: Competence is prerequisite to promotion.noun
Something that is prerequisite, as a course that is required prior to taking an advanced course.