[1] : The Collaborative International Dictionary of English v.0.48

petty \pet"ty\ pe^t"ty^, a. compar. pettier
   pe^t"ti^~er; superl. pettiest. oe. petit, f.
   petit; probably of celtic origin, and akin to e. piece. cf.
   petit.
   little; trifling; inconsiderable; unimportant; also,
   inferior; subordinate; as, a petty fault; petty complaints; a
   petty prince. --denham.
   1913 webster

         like a petty god
         i walked about, admired of all.          --milton.
   1913 webster

   petty averages. see under average.

   petty cash, money expended or received in small items or
      amounts.

   petty officer, a subofficer in the navy, as a gunner, etc.,
      corresponding to a noncommissionned officer in the army.
      1913 webster

   note: for petty constable, petty jury, petty larceny, petty
         treason, see petit.
         1913 webster

   syn: little; diminutive; inconsiderable; inferior; trifling;
        trivial; unimportant; frivolous.
        1913 webster
see also:
pettier pettiest petit petty averages average petty cash 
petty officer 

[2] : WordNet (r) 2.0

petty
     adj 1: inferior in rank or status; "the junior faculty"; "a lowly
            corporal"; "petty officialdom"; "a subordinate
            functionary" syn: junior-grade, inferior, lower,
             lower-ranking, lowly, pettya, secondary, subaltern,
             subordinate
     2: informal terms small and of little importance; "a fiddling
        sum of money"; "a footling gesture"; "our worries are
        lilliputian compared with those of countries that are at
        war"; "a little or small matter"; "mickey mouse
        regulations"; "a dispute over niggling details"; "limited
        to petty enterprises"; "piffling efforts"; "giving a
        police officer a free meal may be against the law, but it
        seems to be a picayune infraction" syn: fiddling, footling,
         lilliputian, little, mickey mouse, niggling, piddling,
         piffling, picayune, trivial
     3: contemptibly narrow in outlook; "petty little comments";
        "disgusted with their small-minded pettiness" syn: small-minded
     also: pettiest, pettier
see also:
junior-grade inferior lower lower-ranking lowly pettya 
secondary subaltern subordinate fiddling footling 
lilliputian little mickey mouse niggling piddling 
piffling picayune trivial small-minded pettiest 
pettier 

[3] : Moby Thesaurus II by Grady Ward, 1.0

176 moby thesaurus words for "petty":
   mickey mouse, abject, abominable, arrant, atrocious, authoritarian,
   base, beggarly, bickering, bigot, bigoted, borne, captious, casual,
   caviling, cheap, cheesy, choplogic, close, closed, constricted,
   contemptible, cramped, creedbound, crummy, cursory, deaf,
   deaf to reason, debased, deficient, degraded, depraved, depthless,
   despicable, dinky, dirty, disgusting, equivocatory, evasive,
   execrable, fanatical, few, flagrant, footling, foul, fulsome,
   grave, gross, grudging, hairsplitting, hedging, heinous, hidebound,
   illiberal, imperfect, impertinent, inadequate, incompetent,
   inconsequent, inconsequential, inconsiderable, inessential,
   inferior, insignificant, insufficient, insular, irrelevant,
   jerkwater, light, little, little-minded, logic-chopping, low,
   low-down, lumpen, maladroit, mangy, meager, mean, mean-minded,
   mean-spirited, measly, mediocre, mingy, miniature, minor,
   miserable, miserly, monstrous, narrow, narrow-hearted,
   narrow-minded, narrow-souled, narrow-spirited, nearsighted,
   nefarious, negligible, niggardly, niggling, nit-picking,
   no great shakes, not comparable, not in it, nugatory, obnoxious,
   odious, of no account, one-horse, out of it, paltering, paltry,
   parochial, parsimonious, peanut, peddling, pettifogging, picayune,
   picayunish, piddling, piffling, pimping, poky, poor, provincial,
   punk, puny, purblind, pussyfooting, quibbling, rank, reptilian,
   scabby, scrubby, scruffy, scummy, scurvy, shabby, shallow, shoddy,
   shoestring, short, shortsighted, shuffling, skin-deep, slight,
   small, small-beer, small-minded, small-time, squalid, stingy,
   straitlaced, stuffy, superficial, tight, tight-fisted, tinhorn,
   tiny, trichoschistic, trifling, trinal, trivial, two-bit,
   two-by-four, twopenny-halfpenny, uncatholic, uncharitable,
   unchivalrous, unconsidered, ungenerous, unimportant, unliberal,
   unmentionable, unskillful, vile, wretched

[4] : U.S. Gazetteer (1990)

petty, tx
  zip codes: 75470

Petty >> P Words
Petty, definition of term: Petty
petty_pag1.html

Petty Larceny >> P Words
Petty Larceny, definition of term: Petty Larceny
petty+larceny_pag1.html

Petty Cash >> P Words
Petty Cash, definition of term: Petty Cash
petty+cash_pag1.html