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Definition of Coterminal
1. Noun. (aviation) One of a number of terminals or airports which are interchangeable for the purposes of ticketing. ¹
2. Adjective. (geometry of two angles) Differing only by a whole number of complete circles. ¹
3. Adjective. (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. ¹
4. Adjective. (context: university education of a student) Simultaneously studying towards two or more separate degrees. ¹
¹ Source: wiktionary.com