"εξάμηνο" looks like "έξι μήνες", that's why exams are each semester !
(and semester = "sex menses" in latine)
so fun to rediscover my own langage ;)
English "exam" is ultimately from Latin exāmen which doesn't seem to be related to Greek εξάμηνος, unfortunately!
I think for British English you should accept "term" as well as "semester"
Agree with Rob.