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1 a jacks plural in form but singular in construction a game played with a set of small objects that are tossed caught and moved in various figures. Jack definition any of various portable devices for raising or lifting heavy objects short heights using various mechanical pneumatic or hydraulic methods see more. A a usually portable device for raising heavy objects by means of force applied with a lever screw or hydraulic press. Jack is a male given namein recent decades jack has become one of the most common names for boys in many english speaking countries while jack is now a proper name in its own right in english it was traditionally used as a diminutive form of johnit can also be used as a diminutive for jacob jason jonathan johann johannes joachim and sometimes for james from its french form jacques. If you are using a screen reader and are having problems using this website please call 800 378 5225 for assistance