The Collaborative International Dictionary of English v.0.48:

Lavatory \Lav"a*to*ry\, n.; pl. Lavatories. [L. lavatorium:
   cf. lavatoire. See Lave to wash, and cf. Laver.]
   1. A place for washing.
      [1913 Webster]

   2. A basin or other vessel for washing in.
      [1913 Webster]

   3. A wash or lotion for a diseased part.
      [1913 Webster]

   4. A place where gold is obtained by washing.
      [1913 Webster]

   5. A room containing one or more sinks for washing, as well
      as one or more toilet fixtures; also called bathroom,
      toilet, and sometimes commode. Commode and toilet may
      refer to a room with only a toilet fixture, but without a
      sink.

   Syn: toilet, lavatory, can, facility, john, privy, bathroom.
        [WordNet 1.5 +PJC]

The Collaborative International Dictionary of English v.0.48:

Toilet \Toi"let\, n. [F. toilette, dim. of toile cloth. See
   Toil a net.]
   1. A covering of linen, silk, or tapestry, spread over a
      table in a chamber or a dressing room.
      [1913 Webster]

   2. A dressing table. --Pope.
      [1913 Webster]

   3. Act or mode of dressing, or that which is arranged in
      dressing; attire; dress; as, her toilet is perfect.
      [Written also toilette.]
      [1913 Webster]

   Toilet glass, a looking-glass for a toilet table or for a
      dressing room.

   Toilet service, Toilet set, earthenware, glass, and other
      utensils for a dressing room.

   Toilet table, a dressing table; a toilet. See def. 2 above.


   To snake one's toilet, to dress one's self; especially, to
      dress one's self carefully.
      [1913 Webster]

WordNet (r) 3.0 (2006):

toilet
    n 1: a room or building equipped with one or more toilets [syn:
         toilet, lavatory, lav, can, john, privy,
         bathroom]
    2: a plumbing fixture for defecation and urination [syn:
       toilet, can, commode, crapper, pot, potty,
       stool, throne]
    3: misfortune resulting in lost effort or money; "his career was
       in the gutter"; "all that work went down the sewer";
       "pensions are in the toilet" [syn: gutter, sewer,
       toilet]
    4: the act of dressing and preparing yourself; "he made his
       morning toilet and went to breakfast" [syn: toilet,
       toilette]

Moby Thesaurus II by Grady Ward, 1.0:

49 Moby Thesaurus words for "toilet":
   WC, backhouse, basement, bathroom, bedpan, bog, can, chamber,
   chamber pot, chemical closet, chemical toilet, closet,
   comfort station, commode, convenience, crapper, dressing,
   earth closet, facilities, facility, grooming, head, hopper, jerry,
   john, johnny, johnny house, jordan, latrine, lavatory, loo,
   making up, necessary, outhouse, piss pot, pot, potty, potty-chair,
   powder room, privy, rest room, stool, throne, thunder mug,
   toilet room, toilette, urinal, washroom, water closet