The Collaborative International Dictionary of English v.0.48:

Gentry \Gen"try\, n. [OE. genterie, gentrie, noble birth,
   nobility, cf. gentrise, and OF. gentelise, genterise, E.
   gentilesse, also OE. genteleri high-mindedness. See Gent,
   a., Gentle, a.]
   1. Birth; condition; rank by birth. [Obs.] "Pride of
      gentrie." --Chaucer.
      [1913 Webster]

            She conquers him by high almighty Jove,
            By knighthood, gentry, and sweet friendship's oath.
                                                  --Shak.
      [1913 Webster]

   2. People of education and good breeding; in England, in a
      restricted sense, those between the nobility and the
      yeomanry. --Macaulay.
      [1913 Webster]

   3. Courtesy; civility; complaisance. [Obs.]
      [1913 Webster]

            To show us so much gentry and good will. --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

gentry
    n 1: the most powerful members of a society [syn: gentry,
         aristocracy]

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "gentry":
   Everyman, John Doe, Public, absolute, aristocracy, better sort,
   body politic, bona fide, citizenry, common man, commonwealth,
   community, community at large, cream, elite, estate, everybody,
   everyman, everyone, everywoman, factual, flower, folk, folks,
   general public, gentility, gentlefolk, gentlefolks, hard, honest,
   indubitable, landed gentry, lesser nobility, men, nation,
   nationality, people, people in general, persons, petite noblesse,
   polity, populace, population, positive, public, quality, real,
   reliable, samurai, sincere, society, squirearchy, state,
   sure-enough, true, trustworthy, unaffected, undesigning,
   undissembled, undoubted, unfeigned, unimpeachable, unquestionable,
   upper class, upper classes, upper crust, veritable, very, world,
   you and me



U.S. Gazetteer Counties (2000):

Gentry -- U.S. County in Missouri
   Population (2000):    6861
   Housing Units (2000): 3214
   Land area (2000):     491.521513 sq. miles (1273.034821 sq. km)
   Water area (2000):    0.286027 sq. miles (0.740807 sq. km)
   Total area (2000):    491.807540 sq. miles (1273.775628 sq. km)
   Located within:       Missouri (MO), FIPS 29
   Location:             40.203034 N, 94.421535 W
   Headwords:
    Gentry
    Gentry, MO
    Gentry County
    Gentry County, MO


U.S. Gazetteer Places (2000):

Gentry, AR -- U.S. city in Arkansas
   Population (2000):    2165
   Housing Units (2000): 930
   Land area (2000):     2.383479 sq. miles (6.173181 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    2.383479 sq. miles (6.173181 sq. km)
   FIPS code:            26290
   Located within:       Arkansas (AR), FIPS 05
   Location:             36.266899 N, 94.484304 W
   ZIP Codes (1990):     72734
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Gentry, AR
    Gentry


U.S. Gazetteer Places (2000):

Gentry, MO -- U.S. village in Missouri
   Population (2000):    101
   Housing Units (2000): 44
   Land area (2000):     0.226625 sq. miles (0.586956 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.226625 sq. miles (0.586956 sq. km)
   FIPS code:            26776
   Located within:       Missouri (MO), FIPS 29
   Location:             40.332140 N, 94.423759 W
   ZIP Codes (1990):     64453
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Gentry, MO
    Gentry