Source : Webster's Revised Unabridged Dictionary (1913)

Pick-up \Pick"-up\, or Pickup \Pick"up`\, n. [Colloq., Cant. or
   Slang]
   1. Act of picking up, as, in various games, the fielding or
      hitting of a ball just after it strikes the ground.

   2. That which picks up; specif.: (Elec.) = {Brush} b.

   3. One that is picked up, as a meal hastily got up for the
      occasion, a chance acquaintance, an informal game, etc.