The Collaborative International Dictionary of English v.0.48:

Monument \Mon"u*ment\, n. [F., fr. L. monumentum, fr. monere to
   remind, admonish. See Monition, and cf. Moniment.]
   1. Something which stands, or remains, to keep in remembrance
      what is past; a memorial.
      [1913 Webster]

            Of ancient British art
            A pleasing monument.                  --Philips.
      [1913 Webster]

            Our bruised arms hung up for monuments. --Shak.
      [1913 Webster]

   2. A building, pillar, stone, or the like, erected to
      preserve the remembrance of a person, event, action, etc.;
      as, the Washington monument; the Bunker Hill monument.
      Also, a tomb, with memorial inscriptions.
      [1913 Webster]

            On your family's old monument
            Hang mournful epitaphs, and do all rites
            That appertain unto a burial.         --Shak.
      [1913 Webster]

   3. A stone or other permanent object, serving to indicate a
      limit or to mark a boundary.
      [1913 Webster]

   4. A saying, deed, or example, worthy of record.
      [1913 Webster]

            Acts and Monuments of these latter and perilous
            days.                                 --Foxe.
      [1913 Webster]

   Syn: Memorial; remembrance; tomb; cenotaph.
        [1913 Webster]

WordNet (r) 3.0 (2006):

monument
    n 1: a structure erected to commemorate persons or events [syn:
         memorial, monument]
    2: an important site that is marked and preserved as public
       property
    3: a burial vault (usually for some famous person) [syn:
       repository, monument]

Moby Thesaurus II by Grady Ward, 1.0:

137 Moby Thesaurus words for "monument":
   antenna tower, arch, archives, barbican, barrow, belfry,
   bell tower, bench mark, bookmark, boundary stone, brass, bust,
   cairn, campanile, carving, catstone, cenotaph, colossus, column,
   commemorate, commemoration, cromlech, cross, cup, cupola,
   cyclolith, derrick, doll, dolly, dolmen, dome, dummy, evidence,
   example, exemplar, fantoccini, figure, figurehead, figurine,
   fire tower, footstone, gingerbread man, grave, gravestone,
   headstone, hoarstone, inscription, landmark, lantern, lay figure,
   ledger, lighthouse, lightship, man of straw, manikin, mannequin,
   marionette, mark, marker, martello, martello tower, mast,
   mausoleum, megalith, memento, memorial, memorial arch,
   memorial column, memorial statue, memorial stone, menhir, milepost,
   milestone, minaret, model, monolith, monumentalize, mound,
   necrology, obelisk, obituary, observation tower, pagoda, pharos,
   pilaster, pillar, pinnacle, plaque, platform, pole, portrait bust,
   prize, puppet, pylon, pyramid, record, reliquary, remembrance,
   ribbon, rostral column, scarecrow, sculpture, seamark, shaft,
   shrine, skyscraper, snowman, spire, standpipe, statuary, statue,
   statuette, steeple, stela, stone, stupa, tablet, television mast,
   testament, testimonial, testimony, token, tomb, tombstone, tope,
   tour, tower, tribute, trophy, turret, watchtower, water tower,
   wax figure, waxwork, windmill tower, witness, wood carving



Bouvier's Law Dictionary, Revised 6th Ed (1856):

MONUMENT. A thing intended to transmit to posterity the memory of some one;
it is used, also, to signify a tomb where a dead body has been deposited. In
this sense it differs from a cenotaph, which is at empty tomb. Dig. 11, 7,
2, 6; Id. 11, 7, 2, 42.



Bouvier's Law Dictionary, Revised 6th Ed (1856):

MONUMENTS. Permanent landmarks established for the purpose of ascertaining
boundaries.
     2. Monuments may be either natural or artificial objects, as rivers,
known streams, springs, or marked trees. 7 Wheat. R. 10; 6 Wheat. R. 582; 9
Cranch, 173; 6 Pet. 498; Pet. C. C. R. 64; 3 Ham. 284; 5 Ham. 534; 5 N. H.
Rep. 524; 3 Dev. 75. Even posts set up at the corners, 5 Ham. 534, and a
clearing, 7 Cowen, 723, are considered as monuments. Sed vide 3 Dev. 75.
     3. When monuments are established, they must govern, although neither
courses, nor distances, nor 'computed' contents correspond; 5 Cowen, 346; 1
Cowen, 605; 6 Cowen, 706; 7 Cowen, 723; 6 Mass. 131; 2 Mass. 380; 3 Pick.
401; 5 Pick. 135; 3 Gill & John. 142,; 5 Har. & John. 163, 255; 2 Id. 260;
Wright, 176; 5 Ham. 534; 1 H. & McH. 355; 2 H. & McH. 416; Cooke, 146; 1
Call, 429; 3 Call, 239; 3 Fairf. 325; 4 H. & M. 125; 1 Hayw. 22; 5 J. J.
Marsh. 578; 3 Hawks, 91; 3 Murph. 88; 4 Monr. 32; 5 Monr. 175; 2 Overt. 200;
2 Bibb, 493; S. C. 6 Wheat. 582; 4 W. C. C. Rep. 15. Vide Boundary.



The Devil's Dictionary (1881-1906):

MONUMENT, n.  A structure intended to commemorate something which
either needs no commemoration or cannot be commemorated.

    The bones of Agammemnon are a show,
    And ruined is his royal monument,

but Agammemnon's fame suffers no diminution in consequence.  The
monument custom has its _reductiones ad absurdum_ in monuments "to the
unknown dead" -- that is to say, monuments to perpetuate the memory of
those who have left no memory.


U.S. Gazetteer Places (2000):

Monument, CO -- U.S. town in Colorado
   Population (2000):    1971
   Housing Units (2000): 770
   Land area (2000):     4.626053 sq. miles (11.981421 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    4.626053 sq. miles (11.981421 sq. km)
   FIPS code:            51800
   Located within:       Colorado (CO), FIPS 08
   Location:             39.081024 N, 104.862491 W
   ZIP Codes (1990):     80132
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Monument, CO
    Monument


U.S. Gazetteer Places (2000):

Monument, OR -- U.S. city in Oregon
   Population (2000):    151
   Housing Units (2000): 81
   Land area (2000):     0.537367 sq. miles (1.391775 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.537367 sq. miles (1.391775 sq. km)
   FIPS code:            49750
   Located within:       Oregon (OR), FIPS 41
   Location:             44.819870 N, 119.420866 W
   ZIP Codes (1990):     97864
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Monument, OR
    Monument


U.S. Gazetteer Places (2000):

Monument, PA -- U.S. Census Designated Place in Pennsylvania
   Population (2000):    133
   Housing Units (2000): 55
   Land area (2000):     0.190680 sq. miles (0.493858 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.190680 sq. miles (0.493858 sq. km)
   FIPS code:            50760
   Located within:       Pennsylvania (PA), FIPS 42
   Location:             41.110388 N, 77.703334 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Monument, PA
    Monument