I am looking for a hypernym for trimester and quarter.
Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
timespans ? periods ?
(warning: I am non native speaker and too low rep to comment)
PS if you downvote, please explain why, so I can learn. Thank you Shyam and all!
btw the title and body of the question has been edited and no more exacly reflects the original question, imho
If you are looking for a hypernym for semester, trimester and quarter, then academic term is the answer.