coterminal

co- +‎ terminal

coterminal (plural coterminals)

1. (aviation) One of a number of terminals or airports which are interchangeable for the purposes of ticketing.

coterminal (not comparable)

1. Coterminous: having the same scope or range, or meeting at the ends.
2. (geometry, of two angles) Differing only by a whole number of complete circles.

   When you try to draw two coterminal angles on a circle, you will find that you only get one line.

3. (category theory) Describing an object in a category, such that there is precisely one morphism that maps that object to every object in the category.
4. (university education, of a student) Simultaneously studying towards two or more separate degrees.

   coterminal student

• (category theory): initial

• (category theory): terminal

• Initial and terminal objects on Wikipedia.Wikipedia