There are 2 definitions of jumper in English:

jumper1

Syllabification: jump·er
Pronunciation: /ˈjəmpər
 
/

noun

1North American A collarless sleeveless dress, typically worn over a blouse.
More example sentences
  • I am in a red jumper, white blouse and tights and black Mary Janes with a small scuff on the left toe.
  • The plump and harried mother, dressed in a denim jumper, drives a battered Econo-Van with numerous dents.
  • She wore a tattered denim jumper and a white shirt that matched the spotted peeling wallpaper, and she knew nothing of wealth.
2British A sweater.
More example sentences
  • Many of the male models modelling knitwear were wearing strong coloured jumpers with nasty white or beige pleated trousers.
  • The other was around 5ft 6ins and had on a dark hooded jumper.
  • The suspect is described as white, aged 18, 5ft 8ins, of large build, wearing a grey hooded jumper.
3 historical A loose outer jacket worn by sailors.

Origin

mid 19th century (sense 3): probably from dialect jump 'short coat,' perhaps from Scots jupe 'a man's (later also a woman's) loose jacket or tunic,' via Old French from Arabic jubba. Compare with jibba.

Definition of jumper in:

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal

There are 2 definitions of jumper in English:

jumper2

Syllabification: jump·er
Pronunciation: /ˈjəmpər
 
/

noun

1A person or animal that jumps.
More example sentences
  • Is the flea the greatest jumper in the animal world, or a skittering frog one of the hot contenders for the swimming title?
  • We now love jumping and he's an amazing jumper, galloping and hacking.
  • He tells us that the horse is a natural jumper.
2 (also jumper wire) A short wire used to complete an electric circuit or bypass a break in a circuit.
More example sentences
  • I read it wrong and placed the jumper wire in the E and F leads.
  • Any problems with the coaxial cable, connectors, jumpers, or the antenna will show up as an abnormality on the display.
  • It is software-configurable with no jumpers, and a 12V control switch is provided for flash memory programming.
3 Basketball another term for jump shot.
4 Nautical A rope made fast to keep a yard or mast from jumping.
5A heavy chisel-ended steel bar for drilling blast holes.

Definition of jumper in: