What is the meaning of Jack?

A coarse mediaeval coat of defence, especially one made of leather.

A man.

1. A name applied to a hypothetical or typical man.
2. A man, a fellow; a typical man; men in general.
3. A sailor.
4. A policeman or detective; a military policeman.

   A name applied to a hypothetical or typical man.

   A man, a fellow; a typical man; men in general.

   A sailor.

   A policeman or detective; a military policeman.

   A manual laborer.

   A lumberjack.

   A sepoy.

   A device or utensil.

   1. A device for turning a spit; a smokejack or roasting jack.
   2. Each of a series of blocks in a harpsichord or the earlier virginal, communicating the action of the key to the quill; sometime also, a hopper in a modern piano.
   3. A support for wood being sawn; a sawhorse or sawbuck.
   4. A device used to hold a boot by the heel, to assist in removing the boot.
   5. A mechanical device used to raise and (temporarily) support a heavy object, now especially to lift one side of a motor vehicle when (e.g.) changing a tyre.

      A device for turning a spit; a smokejack or roasting jack.

      Each of a series of blocks in a harpsichord or the earlier virginal, communicating the action of the key to the quill; sometime also, a hopper in a modern piano.

      A support for wood being sawn; a sawhorse or sawbuck.

      A device used to hold a boot by the heel, to assist in removing the boot.

      A mechanical device used to raise and (temporarily) support a heavy object, now especially to lift one side of a motor vehicle when (e.g.) changing a tyre.

      Any of various levers for raising or lowering the sinkers which push the loops down on the needles in a knitting machine or stocking frame.

      A wedge for separating rocks rent by blasting.

      A grating device used to separate and guide the threads in a warping machine; a heck box.

      A machine for twisting the sliver as it leaves a carding machine, in the preparation of yarn.

      A switch for a jack plug, a jackknife switch; a socket used to connect a device to a circuit, network etc.

      A non-tool object or thing.

      1. A pitcher or other vessel for holding liquid, especially alcoholic drink; a black-jack.
      3. The lowest court card in a deck of standard playing cards, ranking between the 10 and queen, with an image of a knave or pageboy on it.

         A pitcher or other vessel for holding liquid, especially alcoholic drink; a black-jack.

         The lowest court card in a deck of standard playing cards, ranking between the 10 and queen, with an image of a knave or pageboy on it.

         A small, typically white, ball used as the target ball in bowls; a jack-ball.

         A small ship's flag used as a signal or identifying device; a small flag flown at the bow of the vessel.

         A measure of liquid corresponding to a quarter of a pint.

         A fake coin designed to look like a sovereign.

         A jack crosstree.

         A small, six-pointed playing piece used in the game of jacks.

         A torch or other light used in hunting to attract or dazzle game at night.

         Money, cash.

         A strong alcoholic liquor, especially home-distilled or illicit.

         Nothing, not anything, jack shit.

         The eleventh batsman to come to the crease in an innings.

         A smooth often ovoid large gravel or small cobble in a natural water course.

         A plant or animal.

         1. A pike, especially when young.
         2. A male ass, especially when kept for breeding.

            A pike, especially when young.

            A male ass, especially when kept for breeding.

            Any of the marine fish in the family Carangidae.

            A jackrabbit.

            A large California rockfish, the bocaccio, Sebastes paucispinis.

            Mangifera caesia, related to the mango tree.

            Plant in the genus Arisaema, also known as Jack-in-the-pulpit, and capitalized Jack.

            Spadix of a plant (also capitalized Jack).

            Plant of the genus Emex, also considered synonymous to Rumex, if not then containing two species lesser jack and little jack for Emex spinosa syn. Rumex spinosus, Australian English three-corner jack and prickly jack for Emex australis syn. Rumex hypogaeus.

            To physically raise using a jack.

            To raise or increase.

            To increase the potency of an alcoholic beverage similarly to distillation by chilling it to below the freezing point of water, removing the water ice crystals that form, and leaving the still-liquid alcoholic portion.

            To steal (something), typically an automobile; to rob (someone).

            To dance by moving the torso forward and backward in a rippling motion.

            To jack off, to masturbate.

            To fight.

            To jerk or move by jerking; to remove or move (something).

            Tired, disillusioned; fed up (with).

            The edible fruit of the Asian tree (Artocarpus heterophyllus); also the tree itself.

            The related tree Mangifera caesia.

            A home run.

            To hit (the ball) hard; especially, to hit (the ball) out of the field, producing a home run.

            jacket

            jack (an electronic connector mounted on a surface)

            rapist, strictly a male one

            Alternative form of geac

            Source: wiktionary.org