The Collaborative International Dictionary of English v.0.48:

Seduction \Se*duc*tion\, n. [L. seductio: cf. F. s['e]duction.
   See Seduce.]
   1. The act of seducing; enticement to wrong doing; enticement
      to fail in some duty.
      [1913 Webster]

   2. Specifically:
      (a) The offense of inducing a woman to consent to unlawful
          sexual intercourse, by enticements which overcome her
          scruples; the wrong or crime of persuading a woman to
          surrender her chastity. [Archaic]
      (b) Any successful enticement to engage in some sexual
          activity, especially intercourse.
          [1913 Webster +PJC]

   3. That which seduces, or is adapted to seduce; means of
      leading astray; as, the seductions of wealth.
      [1913 Webster]

WordNet (r) 3.0 (2006):

seduction
    n 1: enticing someone astray from right behavior
    2: an act of winning the love or sexual favor of someone [syn:
       seduction, conquest]