noun

• (mathematics) Homologue or analogue of a disk in the Euclidean plane.
• (mathematics) Homologue or analogue of a disk in the Euclidean plane.
• (mathematics) Homologue or analogue of a disk in the Euclidean plane.
• (ballistics, firearms) A solid, spherical nonexplosive missile for a cannon, rifle, gun, etc.

verb

• (transitive) To form or wind into a ball.
  "to ball cotton"
• (metalworking) To heat in a furnace and form into balls for rolling.
• (transitive, US, vulgar) To have sexual intercourse with.
  "Max says it works both ways. “I mean if she comes in and tells me she wants to ball Don, maybe, I say ‘O.K., baby, it's your trip.’”"
• (ambitransitive) To gather balls which cling to the feet or skis, as of damp snow or clay; to gather into balls.
  "the horse balls"

intj

• (sports) An exclamation to inform players on an adjacent playing area that a loose ball from another game has entered their playing area; typically implies that play should be paused until the ball has been retrieved.
• (Australian rules football) An appeal by the crowd for holding the ball against a tackled player.
  "A good tackle (and some bad ones) will bring a cry of "Ball!" from the crowd – a plea for a holding the ball free kick."

noun

• (informal) A very enjoyable time.
  "I had a ball at that concert."