The Collaborative International Dictionary of English v.0.48:

Warden \Ward"en\, n. [OE. wardein, OF. wardein, gardein,
   gardain, F. gardien. See Guardian, and Ward guard.]
   [1913 Webster]
   1. A keeper; a guardian; a watchman.
      [1913 Webster]

            He called to the warden on the . . . battlements.
                                                  --Sir. W.
                                                  Scott.
      [1913 Webster]

   2. An officer who keeps or guards; a keeper; as, the warden
      of a prison.
      [1913 Webster]

   3. A head official; as, the warden of a college; specifically
      (Eccl.), a churchwarden.
      [1913 Webster]

   4. [Properly, a keeping pear.] A large, hard pear, chiefly
      used for baking and roasting. [Obs.]
      [1913 Webster]

            I would have had him roasted like a warden. --Beau.
                                                  & Fl.
      [1913 Webster]

   Warden pie, a pie made of warden pears. [Obs.] --Shak.
      [1913 Webster] Wardenry

WordNet (r) 3.0 (2006):

warden
    n 1: the chief official in charge of a prison

Moby Thesaurus II by Grady Ward, 1.0:

98 Moby Thesaurus words for "warden":
   air warden, alderman, archon, attendant, bailie, bull,
   burghermaster, burgomaster, cabinet member, cabinet minister,
   caretaker, castellan, cerberus, chancellor, chief executive,
   chief executive officer, city councilman, city father,
   city manager, commandant, commissar, commissioner, concierge,
   conservator, councillor, councilman, councilwoman,
   county commissioner, county supervisor, curator, custodian, custos,
   dean, doorkeeper, doorman, elder, executive, executive director,
   executive officer, executive secretary, forest ranger, game warden,
   gamekeeper, gaoler, gatekeeper, governor, guard, guardian,
   guardian angel, headman, induna, jailer, janitor, keeper,
   legislator, lifeguard, lifesaver, lord mayor, magistrate, maire,
   management, managing director, mayor, minister, minister of state,
   next friend, officer, official, ostiary, porter, portreeve,
   prefect, president, prexy, principal keeper, prison guard,
   prochein ami, provost, ranger, receptionist, reeve, screw,
   secretary, secretary of state, selectman, shepherd, steward,
   supervisor, syndic, the administration, treasurer, turnkey,
   undersecretary, usher, vice-chancellor, vice-president, warder,
   watchdog



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

WARDEN. A guardian; a keeper. This is the name given to various officers:
as, the warden of the prison; the wardens of the port of Philadelphia;
church wardens.



U.S. Gazetteer Places (2000):

Warden, WA -- U.S. city in Washington
   Population (2000):    2544
   Housing Units (2000): 790
   Land area (2000):     2.098592 sq. miles (5.435327 sq. km)
   Water area (2000):    0.053520 sq. miles (0.138617 sq. km)
   Total area (2000):    2.152112 sq. miles (5.573944 sq. km)
   FIPS code:            76160
   Located within:       Washington (WA), FIPS 53
   Location:             46.966250 N, 119.043138 W
   ZIP Codes (1990):     98857
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Warden, WA
    Warden