The Collaborative International Dictionary of English v.0.48:

Pecuniary \Pe*cun"ia*ry\ (p[-e]*k[=u]n"y[asl]*r[i^]*l[y^]), a.
   [L. pecuniarius, fr. pecunia money, orig., property in
   cattle, fr. pecus cattle: cf. F. p['e]cuniaire. See Fee,
   and cf. Peculiar.]
   1. Relating to money; monetary; as, a pecuniary penalty; a
      pecuniary reward. --Burke.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pecuniary
    adj 1: relating to or involving money; "monetary rewards"; "he
           received thanks but no pecuniary compensation for his
           services" [syn: monetary, pecuniary]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

PECUNIARY. That which relates to money.
     2. Pecuniary punishment, is one which imposes a fine on a convict; a
pecuniary legacy is one which entitles the legatee to receive a sum of
money, and not a specific chattel. In the ecclesiastical law, by pecuniary
causes is understood such causes as arise either from the withholding
ecclesiastical dues, or the doing or omitting such acts relating to the
church, in consequence of which damage accrues to the plaintiff. In England
these causes are cognizable in the ecclesiastical courts.