The Collaborative International Dictionary of English v.0.48:

Gregory \Gregory\ prop. n.
   1. Pope Gregory XIII., born 1572, died 1585, the pope who
      introduced the modern calendar.

   Syn: Gregory XIII, Ugo Buoncompagni.
        [WordNet 1.5]

   2. Pope Gregory I., born circa 540, died 604; the pope for
      whom Gregorian chants were named.

   Syn: Gregory I, Saint Gregory I, Gregory the Great.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Gregory
    n 1: (Roman Catholic Church) a church father known for his
         constant fight against perceived heresies; a saint and
         Doctor of the Church (329-391) [syn: Gregory, Gregory
         Nazianzen, Gregory of Nazianzen, St. Gregory of
         Nazianzen]
    2: Italian pope from 1831 to 1846; conservative in politics and
       theology; worked to propagate Catholicism in England and the
       United States (1765-1846) [syn: Gregory, Gregory XVI,
       Bartolomeo Alberto Capillari]
    3: the pope who sponsored the introduction of the modern
       calendar (1572-1585) [syn: Gregory, Gregory XIII, Ugo
       Buoncompagni]
    4: the Italian pope from 1406 to 1415 who worked to end the
       Great Schism and who retired to make it possible (1327-1417)
       [syn: Gregory, Gregory XII, Angelo Correr]
    5: the Italian pope who fought to establish the supremacy of the
       pope over the Roman Catholic Church and the supremacy of the
       church over the state (1020-1085) [syn: Gregory, Gregory
       VII, Hildebrand]
    6: (Roman Catholic Church) an Italian pope distinguished for his
       spiritual and temporal leadership; a saint and Doctor of the
       Church (540?-604) [syn: Gregory, Gregory I, Saint
       Gregory I, St. Gregory I, Gregory the Great]

U.S. Gazetteer Counties (2000):

Gregory -- U.S. County in South Dakota
   Population (2000):    4792
   Housing Units (2000): 2405
   Land area (2000):     1015.934636 sq. miles (2631.258515 sq. km)
   Water area (2000):    37.511128 sq. miles (97.153372 sq. km)
   Total area (2000):    1053.445764 sq. miles (2728.411887 sq. km)
   Located within:       South Dakota (SD), FIPS 46
   Location:             43.183400 N, 99.205492 W
   Headwords:
    Gregory
    Gregory, SD
    Gregory County
    Gregory County, SD


U.S. Gazetteer Places (2000):

Gregory, OK -- U.S. Census Designated Place in Oklahoma
   Population (2000):    150
   Housing Units (2000): 55
   Land area (2000):     3.014063 sq. miles (7.806386 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    3.014063 sq. miles (7.806386 sq. km)
   FIPS code:            31425
   Located within:       Oklahoma (OK), FIPS 40
   Location:             36.165593 N, 95.574186 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Gregory, OK
    Gregory


U.S. Gazetteer Places (2000):

Gregory, SD -- U.S. city in South Dakota
   Population (2000):    1342
   Housing Units (2000): 718
   Land area (2000):     1.365704 sq. miles (3.537158 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.365704 sq. miles (3.537158 sq. km)
   FIPS code:            26180
   Located within:       South Dakota (SD), FIPS 46
   Location:             43.233924 N, 99.428580 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Gregory, SD
    Gregory


U.S. Gazetteer Places (2000):

Gregory, TX -- U.S. city in Texas
   Population (2000):    2318
   Housing Units (2000): 743
   Land area (2000):     1.416189 sq. miles (3.667913 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.416189 sq. miles (3.667913 sq. km)
   FIPS code:            31064
   Located within:       Texas (TX), FIPS 48
   Location:             27.920604 N, 97.292480 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Gregory, TX
    Gregory