The Collaborative International Dictionary of English v.0.48:

Junior \Jun"ior\, n.
   1. A younger person.
      [1913 Webster]

            His junior she, by thirty years.      --Byron.
      [1913 Webster]

   2. Hence: One of a lower or later standing; specifically, in
      American colleges and four-year high schools, one in the
      third year of his course, one in the fourth or final year
      being designated a senior; in some seminaries, one in
      the first year, in others, one in the second year, of a
      three years' course.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Junior \Jun"ior\ (j[=u]n"y[~e]r; 277), a. [L. contr. fr.
   juvenior, compar. of juvenis young. See Juvenile.]
   [1913 Webster]
   1. Less advanced in age than another; younger. Abbreviated
      Jr.
      [1913 Webster +PJC]

   Note: Junior is applied to distinguish the younger of two
         persons bearing the same name in the same family, and
         is opposed to senior or elder. Commonly applied to a
         son who has the same Christian name as his father.
         [1913 Webster]

   2. Lower in standing or in rank, or having entered later into
      a position or office; as, a junior partner; junior
      counsel; junior captain; the junior Senator from New York.
      [1913 Webster]

   3. Composed of juniors, whether younger or a lower standing;
      as, the junior class; the junior baseball league; of or
      pertaining to juniors or to a junior class. See Junior,
      n., 2.
      [1913 Webster]

   4. Belonging to a younger person, or an earlier time of life.
      [1913 Webster]

            Our first studies and junior endeavors. --Sir T.
                                                  Browne.
      [1913 Webster]

   5. of or relating to the third year of a four-year term; --
      used of the third or next to final year in a U. S. high
      school or college. See junior[2], n..

   Syn: third-year.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

junior
    adj 1: younger; lower in rank; shorter in length of tenure or
           service [ant: senior]
    2: used of the third or next to final year in United States high
       school or college; "the junior class"; "a third-year student"
       [syn: junior(a), third-year, next-to-last]
    3: including or intended for youthful persons; "a junior sports
       league"; "junior fashions"
    n 1: term of address for a disrespectful and annoying male;
         "look here, junior, it's none of your business"
    2: a third-year undergraduate
    3: the younger of two persons; "she is two years my junior"
    4: a son who has the same first name as his father [syn:
       Junior, Jr, Jnr]

Moby Thesaurus II by Grady Ward, 1.0:

95 Moby Thesaurus words for "junior":
   adolescent, after, assistant, attendant, baby, cadet, cog, common,
   commonality, commonalty, consecutive, creature, demeaning,
   disadvantaged, employee, ensuing, fledgling, flunky, follower,
   following, freshman, helper, hoi polloi, hopeful, humble,
   in the shade, infant, inferior, infra dig, juvenal, juvenile,
   later, less, lesser, lightweight, lineal, low, lower, lower class,
   lower orders, lowly, masses, midshipman, minor, modest, ordinary,
   pawn, plebe, posterior, pubescent, puisne, right-hand man, sapling,
   second fiddle, second rank, second string, secondary, senior,
   sequent, servant, servile, slip, soph, sophomore, sprig, stripling,
   sub, subaltern, subject, subordinate, subsequent, subservient,
   succeeding, successive, teenager, teener, teenybopper, third rank,
   third string, third stringer, undergrad, undergraduate, underling,
   underprivileged, understrapper, upperclassman, vulgar, yes-man,
   young hopeful, young person, younger, youngest, youngling,
   youngster, youth



U.S. Gazetteer Places (2000):

Junior, WV -- U.S. town in West Virginia
   Population (2000):    450
   Housing Units (2000): 202
   Land area (2000):     0.297856 sq. miles (0.771443 sq. km)
   Water area (2000):    0.022755 sq. miles (0.058935 sq. km)
   Total area (2000):    0.320611 sq. miles (0.830378 sq. km)
   FIPS code:            42244
   Located within:       West Virginia (WV), FIPS 54
   Location:             38.977379 N, 79.950300 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Junior, WV
    Junior