The Collaborative International Dictionary of English v.0.48:

Boarding \Board"ing\, n.
   1. (Naut.) The act of entering a ship, whether with a hostile
      or a friendly purpose.
      [1913 Webster]

            Both slain at one time, as they attempted the
            boarding of a frigate.                --Sir F.
                                                  Drake.
      [1913 Webster]

   2. The act of covering with boards; also, boards,
      collectively; or a covering made of boards.
      [1913 Webster]

   3. The act of supplying, or the state of being supplied, with
      regular or specified meals, or with meals and lodgings,
      for pay.
      [1913 Webster]

   Boarding house, a house in which boarders are kept.

   Boarding nettings (Naut.), a strong network of cords or
      ropes erected at the side of a ship to prevent an enemy
      from boarding it.

   Boarding pike (Naut.), a pike used by sailors in boarding a
      vessel, or in repelling an attempt to board it. --Totten.

   Boarding school, a school in which pupils receive board and
      lodging as well as instruction.
      [1913 Webster]

WordNet (r) 3.0 (2006):

boarding house
    n 1: a private house that provides accommodations and meals for
         paying guests [syn: boarding house, boardinghouse]