The Collaborative International Dictionary of English v.0.48:

Aurora \Au*ro"ra\, n.; pl. E. Auroras, L. (rarely used)
   Auror[ae]. [L. aurora, for ausosa, akin to Gr. ?, ?, dawn,
   Skr. ushas, and E. east.]
   1. The rising light of the morning; the dawn of day; the
      redness of the sky just before the sun rises.
      [1913 Webster]

   2. The rise, dawn, or beginning. --Hawthorne.
      [1913 Webster]

   3. (Class. Myth.) The Roman personification of the dawn of
      day; the goddess of the morning. The poets represented her
      a rising out of the ocean, in a chariot, with rosy fingers
      dropping gentle dew.
      [1913 Webster]

   4. (Bot.) A species of crowfoot. --Johnson.
      [1913 Webster]

   5. The aurora borealis or aurora australis (northern or
      southern lights).
      [1913 Webster]

   Aurora borealis, i. e., northern daybreak; popularly called
      northern lights. A luminous meteoric phenomenon, visible
      only at night, and supposed to be of electrical origin.
      This species of light usually appears in streams,
      ascending toward the zenith from a dusky line or bank, a
      few degrees above the northern horizon; when reaching
      south beyond the zenith, it forms what is called the
      corona, about a spot in the heavens toward which the
      dipping needle points. Occasionally the aurora appears as
      an arch of light across the heavens from east to west.
      Sometimes it assumes a wavy appearance, and the streams of
      light are then called merry dancers. They assume a variety
      of colors, from a pale red or yellow to a deep red or
      blood color. The

   Aurora australisis a corresponding phenomenon in the
      southern hemisphere, the streams of light ascending in the
      same manner from near the southern horizon.
      [1913 Webster]

WordNet (r) 3.0 (2006):

aurora
    n 1: the first light of day; "we got up before dawn"; "they
         talked until morning" [syn: dawn, dawning, morning,
         aurora, first light, daybreak, break of day, break
         of the day, dayspring, sunrise, sunup, cockcrow]
         [ant: sundown, sunset]
    2: an atmospheric phenomenon consisting of bands of light caused
       by charged solar particles following the earth's magnetic
       lines of force
    3: (Roman mythology) goddess of the dawn; counterpart of Greek
       Eos

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "aurora":
   alpenglow, arch aurora, aurora australis, aurora borealis,
   aurora glory, aurora polaris, break of day, brightening,
   chanticleer, cockcrow, cocklight, crack of dawn, crepuscule, dawn,
   dawning, dawnlight, day-peep, daybreak, daylight, dayspring,
   first brightening, first light, foredawn, glow, half-light, light,
   merry dancers, morn, morning, morning twilight, northern lights,
   peep of day, polar lights, polar ray, prime, southern lights,
   sunrise, sunup, the small hours, twilight, vestibule of Day



The Free On-line Dictionary of Computing (30 December 2018):

Aurora

    A Prolog implementation with or-parallelism.

   ["The Aurora Or-Parallel Prolog System", E. Lusk et al, Proc
   3rd Intl Conf on Fifth Generation Comp Systems, pp. 819-830,
   ICOT, A-W 1988].

   (2018-01-01)


U.S. Gazetteer Counties (2000):

Aurora -- U.S. County in South Dakota
   Population (2000):    3058
   Housing Units (2000): 1298
   Land area (2000):     708.178630 sq. miles (1834.174153 sq. km)
   Water area (2000):    4.350324 sq. miles (11.267286 sq. km)
   Total area (2000):    712.528954 sq. miles (1845.441439 sq. km)
   Located within:       South Dakota (SD), FIPS 46
   Location:             43.705151 N, 98.542675 W
   Headwords:
    Aurora
    Aurora, SD
    Aurora County
    Aurora County, SD


U.S. Gazetteer Places (2000):

Aurora, NE -- U.S. city in Nebraska
   Population (2000):    4225
   Housing Units (2000): 1798
   Land area (2000):     1.883621 sq. miles (4.878555 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.883621 sq. miles (4.878555 sq. km)
   FIPS code:            02690
   Located within:       Nebraska (NE), FIPS 31
   Location:             40.866716 N, 98.003537 W
   ZIP Codes (1990):     68818
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Aurora, NE
    Aurora


U.S. Gazetteer Places (2000):

Aurora, NY -- U.S. village in New York
   Population (2000):    720
   Housing Units (2000): 225
   Land area (2000):     0.959538 sq. miles (2.485191 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.959538 sq. miles (2.485191 sq. km)
   FIPS code:            03188
   Located within:       New York (NY), FIPS 36
   Location:             42.746782 N, 76.699442 W
   ZIP Codes (1990):     13026
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Aurora, NY
    Aurora


U.S. Gazetteer Places (2000):

Aurora, CO -- U.S. city in Colorado
   Population (2000):    276393
   Housing Units (2000): 109260
   Land area (2000):     142.503578 sq. miles (369.082557 sq. km)
   Water area (2000):    0.238589 sq. miles (0.617943 sq. km)
   Total area (2000):    142.742167 sq. miles (369.700500 sq. km)
   FIPS code:            04000
   Located within:       Colorado (CO), FIPS 08
   Location:             39.695887 N, 104.808101 W
   ZIP Codes (1990):     80010 80011 80012 80013 80014 80015
                         80016 80017 80018 80019 80045
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Aurora, CO
    Aurora


U.S. Gazetteer Places (2000):

Aurora, NC -- U.S. town in North Carolina
   Population (2000):    583
   Housing Units (2000): 316
   Land area (2000):     0.946708 sq. miles (2.451963 sq. km)
   Water area (2000):    0.091933 sq. miles (0.238106 sq. km)
   Total area (2000):    1.038641 sq. miles (2.690069 sq. km)
   FIPS code:            02620
   Located within:       North Carolina (NC), FIPS 37
   Location:             35.301476 N, 76.789461 W
   ZIP Codes (1990):     27806
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Aurora, NC
    Aurora


U.S. Gazetteer Places (2000):

Aurora, OH -- U.S. city in Ohio
   Population (2000):    13556
   Housing Units (2000): 5361
   Land area (2000):     23.221389 sq. miles (60.143119 sq. km)
   Water area (2000):    0.871819 sq. miles (2.258002 sq. km)
   Total area (2000):    24.093208 sq. miles (62.401121 sq. km)
   FIPS code:            03086
   Located within:       Ohio (OH), FIPS 39
   Location:             41.319254 N, 81.355859 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Aurora, OH
    Aurora


U.S. Gazetteer Places (2000):

Aurora, IL -- U.S. city in Illinois
   Population (2000):    142990
   Housing Units (2000): 48797
   Land area (2000):     38.526020 sq. miles (99.781930 sq. km)
   Water area (2000):    0.893204 sq. miles (2.313387 sq. km)
   Total area (2000):    39.419224 sq. miles (102.095317 sq. km)
   FIPS code:            03012
   Located within:       Illinois (IL), FIPS 17
   Location:             41.759879 N, 88.298482 W
   ZIP Codes (1990):     60504 60505 60506
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Aurora, IL
    Aurora


U.S. Gazetteer Places (2000):

Aurora, OR -- U.S. city in Oregon
   Population (2000):    655
   Housing Units (2000): 262
   Land area (2000):     0.454299 sq. miles (1.176630 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.454299 sq. miles (1.176630 sq. km)
   FIPS code:            03300
   Located within:       Oregon (OR), FIPS 41
   Location:             45.230157 N, 122.755389 W
   ZIP Codes (1990):     97002
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Aurora, OR
    Aurora


U.S. Gazetteer Places (2000):

Aurora, IN -- U.S. city in Indiana
   Population (2000):    3965
   Housing Units (2000): 1716
   Land area (2000):     2.776314 sq. miles (7.190619 sq. km)
   Water area (2000):    0.143297 sq. miles (0.371137 sq. km)
   Total area (2000):    2.919611 sq. miles (7.561756 sq. km)
   FIPS code:            02782
   Located within:       Indiana (IN), FIPS 18
   Location:             39.058551 N, 84.906351 W
   ZIP Codes (1990):     47001
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Aurora, IN
    Aurora


U.S. Gazetteer Places (2000):

Aurora, IA -- U.S. city in Iowa
   Population (2000):    194
   Housing Units (2000): 88
   Land area (2000):     0.573115 sq. miles (1.484361 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.573115 sq. miles (1.484361 sq. km)
   FIPS code:            03835
   Located within:       Iowa (IA), FIPS 19
   Location:             42.618061 N, 91.728519 W
   ZIP Codes (1990):     50607
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Aurora, IA
    Aurora


U.S. Gazetteer Places (2000):

Aurora, KS -- U.S. city in Kansas
   Population (2000):    79
   Housing Units (2000): 39
   Land area (2000):     0.100954 sq. miles (0.261470 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.100954 sq. miles (0.261470 sq. km)
   FIPS code:            03425
   Located within:       Kansas (KS), FIPS 20
   Location:             39.451641 N, 97.530396 W
   ZIP Codes (1990):     67417
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Aurora, KS
    Aurora


U.S. Gazetteer Places (2000):

Aurora, SD -- U.S. town in South Dakota
   Population (2000):    500
   Housing Units (2000): 221
   Land area (2000):     0.458504 sq. miles (1.187519 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.458504 sq. miles (1.187519 sq. km)
   FIPS code:            02780
   Located within:       South Dakota (SD), FIPS 46
   Location:             44.283215 N, 96.686048 W
   ZIP Codes (1990):     57002
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Aurora, SD
    Aurora


U.S. Gazetteer Places (2000):

Aurora, TX -- U.S. town in Texas
   Population (2000):    853
   Housing Units (2000): 332
   Land area (2000):     3.228153 sq. miles (8.360877 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    3.228153 sq. miles (8.360877 sq. km)
   FIPS code:            04672
   Located within:       Texas (TX), FIPS 48
   Location:             33.058295 N, 97.516220 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Aurora, TX
    Aurora


U.S. Gazetteer Places (2000):

Aurora, UT -- U.S. city in Utah
   Population (2000):    947
   Housing Units (2000): 321
   Land area (2000):     1.011631 sq. miles (2.620111 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.011631 sq. miles (2.620111 sq. km)
   FIPS code:            02740
   Located within:       Utah (UT), FIPS 49
   Location:             38.921241 N, 111.936427 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Aurora, UT
    Aurora


U.S. Gazetteer Places (2000):

Aurora, MN -- U.S. city in Minnesota
   Population (2000):    1850
   Housing Units (2000): 893
   Land area (2000):     3.795947 sq. miles (9.831458 sq. km)
   Water area (2000):    0.138476 sq. miles (0.358652 sq. km)
   Total area (2000):    3.934423 sq. miles (10.190110 sq. km)
   FIPS code:            02872
   Located within:       Minnesota (MN), FIPS 27
   Location:             47.529281 N, 92.240164 W
   ZIP Codes (1990):     55705
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Aurora, MN
    Aurora


U.S. Gazetteer Places (2000):

Aurora, MO -- U.S. city in Missouri
   Population (2000):    7014
   Housing Units (2000): 3093
   Land area (2000):     5.485122 sq. miles (14.206401 sq. km)
   Water area (2000):    0.005816 sq. miles (0.015064 sq. km)
   Total area (2000):    5.490938 sq. miles (14.221465 sq. km)
   FIPS code:            02548
   Located within:       Missouri (MO), FIPS 29
   Location:             36.969956 N, 93.720574 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Aurora, MO
    Aurora