Dictionary definition · Jack
noun
- a man who serves as a sailor
- a small worthless amount"you don't know jack"
- someone who works with their hands; someone engaged in manual labor
- immense East Indian fruit resembling breadfruit; it contains an edible pulp and nutritious seeds that are commonly roasted
- a small ball at which players aim in lawn bowling
- an electrical device consisting of a connector socket designed for the insertion of a plug
- game equipment consisting of one of several small six-pointed metal pieces that are picked up while bouncing a ball in the game of jacks
- small flag indicating a ship's nationality
- one of four face cards in a deck bearing a picture of a young prince
- tool for exerting pressure or lifting
verb
- lift with a special device"jack up the car so you can change the tire"
- hunt with a jacklight
Source: Open English WordNet (CC BY 4.0).