The Collaborative International Dictionary of English v.0.48:

Plantation \Plan*ta"tion\, n. [L. plantatio: cf. F. plantation.]
   1. The act or practice of planting, or setting in the earth
      for growth. [R.]
      [1913 Webster]

   2. The place planted; land brought under cultivation; a piece
      of ground planted with trees or useful plants; esp., in
      the United States and West Indies, a large estate
      appropriated to the production of the more important
      crops, and cultivated by laborers who live on the estate;
      as, a cotton plantation; a coffee plantation.
      [1913 Webster]

   3. An original settlement in a new country; a colony.
      [1913 Webster]

            While these plantations were forming in Connecticut.
                                                  --B. Trumbull.
      [1913 Webster]

WordNet (r) 3.0 (2006):

plantation
    n 1: an estate where cash crops are grown on a large scale
         (especially in tropical areas)
    2: a newly established colony (especially in the colonization of
       North America); "the practice of sending convicted criminals
       to serve on the Plantations was common in the 17th century"
    3: garden consisting of a small cultivated wood without
       undergrowth [syn: grove, woodlet, orchard,
       plantation]

Moby Thesaurus II by Grady Ward, 1.0:

76 Moby Thesaurus words for "plantation":
   anchorage, arable land, barnyard, barton, cattle ranch,
   chicken farm, clump, collective farm, colonization,
   cotton plantation, croft, crop, dairy farm, demesne, demesne farm,
   dry farm, dude ranch, empeoplement, establishment, factory farm,
   fallow, farm, farmery, farmhold, farmland, farmplace, farmstead,
   farmyard, fixation, foundation, fruit farm, fur farm, grain farm,
   grange, grassland, growth, hacienda, hassock, homecroft, homefarm,
   homestead, inauguration, inhabiting, initiation, installation,
   installment, investiture, kibbutz, kolkhoz, location, lodgment,
   mains, manor farm, mooring, orchard, pasture, pen, peoplement,
   peopling, planting, population, poultry farm, ranch, rancheria,
   rancho, settlement, settling, sheep farm, stand, station, steading,
   stock farm, toft, truck farm, tuft, tussock



U.S. Gazetteer Places (2000):

Plantation, FL -- U.S. city in Florida
   Population (2000):    82934
   Housing Units (2000): 34999
   Land area (2000):     21.737874 sq. miles (56.300832 sq. km)
   Water area (2000):    0.193331 sq. miles (0.500726 sq. km)
   Total area (2000):    21.931205 sq. miles (56.801558 sq. km)
   FIPS code:            57425
   Located within:       Florida (FL), FIPS 12
   Location:             26.124354 N, 80.249503 W
   ZIP Codes (1990):     33317 33324
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Plantation, FL
    Plantation


U.S. Gazetteer Places (2000):

Plantation, FL -- U.S. Census Designated Place in Florida
   Population (2000):    4168
   Housing Units (2000): 2837
   Land area (2000):     2.447822 sq. miles (6.339829 sq. km)
   Water area (2000):    0.003509 sq. miles (0.009087 sq. km)
   Total area (2000):    2.451331 sq. miles (6.348916 sq. km)
   FIPS code:            57450
   Located within:       Florida (FL), FIPS 12
   Location:             27.063568 N, 82.370146 W
   ZIP Codes (1990):     33317 33324
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Plantation, FL
    Plantation


U.S. Gazetteer Places (2000):

Plantation, KY -- U.S. city in Kentucky
   Population (2000):    902
   Housing Units (2000): 375
   Land area (2000):     0.201770 sq. miles (0.522582 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.201770 sq. miles (0.522582 sq. km)
   FIPS code:            61554
   Located within:       Kentucky (KY), FIPS 21
   Location:             38.283420 N, 85.591635 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Plantation, KY
    Plantation