corequisite
nounEtymology From co- + requisite.
1
Education A course that must be or can be taken concurrently with a given course.
2
Any of a set of things that require each other.
- These three fix releases are corequisites of each other and must be applied together for all the fixes to work.2011, Frank Tsui, Orlando Karam, Essentials of Software Engineering, page 332: