(sem-pie) student senior to oneself; someone with a higher rank or who attained the same rank at an earlier date. (see kohai)

a classmate, older (?)

A term of respect used for someone else who is guiding you in some area. In Japanese schools, it is used by students for those in higher classes. It can be used as a noun, or as an honorific suffix to someone's name. (The inverse relationship is "kouhai".)

the status sometimes given to a older/higher assistant by the Sensei of a dojo. Generally the Sempai also trains himself to become a Sensei

Class monitor