きゅう【級】
1〔等級〕a grade; a class級を上げる「promote a person [move a person up] to a higher grade [rank]級を下げるdemot...
きゅうすう【級数】
a series; a progression等差［等比］級数「an arithmetic [a geometric] series有限［無限］級数「a finite [an infinite]...
きゅうゆう【級友】
a classmate
きゅうちょう【級長】
the head of a class; the class leader
きゅうゆう【級友】
a classmate
