Source : WordNet®

laptop computer
     n : a portable computer small enough to use in your lap [syn: {laptop}]

Source : Free On-Line Dictionary of Computing

laptop computer
     
         (Commonly just "laptop") A portable {personal
        computer} of a size suitable to rest comfortably on one's
        legs.  A laptop is smaller than a "{luggable}" (portable, but
        not comfortably) but bigger than a "{palmtop}" (easily carried
        in one hand or a shirt pocket).
     
        {Toshiba} were one of the first companies to produce laptops,
        in about 1989.
     
        [First example?  Date?  Difference from "notebook"?]
     
        (1994-12-21)