Quick definitions from Macmillan ( )

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Quick definitions from WordNet (jack)

▸ noun:  male donkey
▸ noun:  any of several fast-swimming predacious fishes of tropical to warm-temperate seas
▸ noun:  tool for exerting pressure or lifting
▸ noun:  one of four face cards in a deck bearing a picture of a young prince
▸ noun:  small flag indicating a ship's nationality
▸ noun:  game equipment consisting of one of several small objects picked up while bouncing a ball in the game of jacks
▸ noun:  an electrical device consisting of a connector socket designed for the insertion of a plug
▸ noun:  a small worthless amount ("You don't know jack")
▸ noun:  immense East Indian fruit resembling breadfruit of; its seeds are commonly roasted
▸ noun:  someone who works with their hands; someone engaged in manual labor
▸ noun:  a man who serves as a sailor
▸ verb:  lift with a special device ("Jack up the car so you can change the tire")
▸ verb:  hunt with a jacklight
▸ name:  A male given name (very common: 1 in 317 males; popularity rank in the U.S.: #53)
▸ name:  A surname (common: 1 in 14285 families; popularity rank in the U.S.: #1852)
▸ name:  A female given name (rare: 1 in 100000 females; popularity rank in the U.S.: #3217)

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▸ Word origin