Source : Webster's Revised Unabridged Dictionary (1913)

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.