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]