Oxford Advanced American Dictionary

Definition of jumper noun from the Oxford Advanced Learner's Dictionary

jumper

noun
jumper pronunciation English ˈdʒʌmpə(r) jumper pronunciation American ˈdʒʌmpər
 
1 (British English) a knitted piece of clothing made of wool or cotton for the upper part of the body, with long sleeves and no buttonsa woolly jumper2 (North American English) = pinafore3 a person, an animal or an insect that jumpsHe's a good jumper.