Definitions of liner:

• noun:   (baseball) a hit that flies straight out from the batter

  Example: "The batter hit a liner to the shortstop"

• noun:   a large commercial ship (especially one that carries passengers on a regular schedule)
• noun:   a piece of cloth that is used as the inside surface of a garment
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #11677)