Definitions of jacks:

  • noun:   a game in which jackstones are thrown and picked up in various groups between bounces of a small rubber ball
  • noun:   plaything consisting of small 6-pointed metal pieces that are used (along with a ball) to play the game of jacks
  • name:  A surname (rare: 1 in 33333 families; popularity rank in the U.S.: #3796)