(short) jacket; blouson; windbreaker; jumper
ski jumper; jumping event athlete
jumper lead; jumper wire
暑いのでジャンパーを脱ぎます。
It's hot, so I'll take off my jacket.
会社から新しいジャンパーが支給される予定だ。
A new jacket is scheduled to be issued by the company.
このジャンパーはとても暖かい。
This jacket is very warm.