The Collaborative International Dictionary of English v.0.48:

Maverick \Mav"er*ick\, v. t.
   To take a maverick. [Western U. S.]
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Maverick \Mav"er*ick\, n.
   In the southwestern part of the united States, a bullock or
   heifer that has not been branded, and is unclaimed or wild;
   -- said to be from Maverick, the name of a cattle owner in
   Texas who neglected to brand his cattle.
   [1913 Webster]

WordNet (r) 3.0 (2006):

maverick
    adj 1: independent in behavior or thought; "she led a somewhat
           irregular private life"; "maverick politicians" [syn:
           irregular, maverick, unorthodox]
    n 1: someone who exhibits great independence in thought and
         action [syn: maverick, rebel]
    2: an unbranded range animal (especially a stray calf); belongs
       to the first person who puts a brand on it

Moby Thesaurus II by Grady Ward, 1.0:

144 Moby Thesaurus words for "maverick":
   Bohemian, Brahman, Indian buffalo, agitator, alien, ass, aurochs,
   beat, beatnik, beef, beef cattle, beeves, bigot, bison,
   bitter-ender, bossy, bovine, bovine animal, brawler, breakaway,
   buffalo, bull, bullethead, bullock, calf, carabao, case, cattle,
   character, cow, crackpot, crank, critter, dairy cattle, dairy cow,
   deviant, diehard, dissenter, dogie, dogmatist, donkey, dropout,
   eccentric, extremist, fanatic, far out, flower child, freak,
   free and easy, fringy, frondeur, hardnose, heifer, heretic,
   heretical, hermit, heterodox, hippie, hobo, hornless cow, informal,
   insubordinate, insurgent, insurrectionary, insurrectionist,
   insurrecto, intransigeant, intransigent, kine, kinky, kook,
   last-ditcher, leppy, lone wolf, loner, malcontent, meshuggenah,
   milch cow, milcher, milk cow, milker, misfit, mule, muley cow,
   muley head, musk-ox, mutineer, natural, neat, nonconformist,
   nonjuror, not cricket, not done, not kosher, nut, odd fellow,
   oddball, oddity, offbeat, original, outsider, ox, oxen, pariah,
   perverse fool, pighead, positivist, purist, queer duck, queer fish,
   queer specimen, rara avis, rebel, revolter, revolutionary,
   revolutionist, rioter, screwball, sectarian, sectary, solitary,
   standpat, standpatter, steer, stickler, stirk, stot, subversive,
   swinger, traitor, tramp, type, ugly duckling, unconformist,
   unconventional, unfashionable, unorthodox, way out, wisent, yak,
   yearling, yippie, zealot, zebu



U.S. Gazetteer Counties (2000):

Maverick -- U.S. County in Texas
   Population (2000):    47297
   Housing Units (2000): 14889
   Land area (2000):     1280.075258 sq. miles (3315.379558 sq. km)
   Water area (2000):    11.664875 sq. miles (30.211885 sq. km)
   Total area (2000):    1291.740133 sq. miles (3345.591443 sq. km)
   Located within:       Texas (TX), FIPS 48
   Location:             28.742950 N, 100.387315 W
   Headwords:
    Maverick
    Maverick, TX
    Maverick County
    Maverick County, TX