I am looking for a hypernym for trimester and quarter.
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.