The Collaborative International Dictionary of English v.0.48:

Pilfer \Pil"fer\, v. i. [imp. & p. p. Pilfered; p. pr. & vb.
   n. Pilfering.] [OF. pelfrer. See Pelf.]
   To steal in small quantities, or articles of small value; to
   practice petty theft.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pilfering \Pil"fer*ing\, a.
   Thieving in a small way. --Shak. -- n. Petty theft. --
   Pil"fer*ing*ly, adv.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

57 Moby Thesaurus words for "pilfering":
   abstraction, abuse, abuse of office, annexation, appropriation,
   befoulment, boosting, conversion, conveyance,
   corrupt administration, debasement, defalcation, defilement,
   desecration, diversion, embezzlement, filching, fouling, fraud,
   graft, liberation, lifting, maladministration, malfeasance,
   malpractice, malversation, misapplication, misappropriation,
   misconduct, misemployment, misfeasance, mishandling, mismanagement,
   misusage, misuse, peculation, perversion, pilferage, pinching,
   poaching, pollution, poor stewardship, profanation, prostitution,
   scrounging, shoplifting, snatching, sneak thievery, snitching,
   stealage, stealing, swindle, swiping, theft, thievery, thieving,
   violation