[1] : The Collaborative International Dictionary of English v.0.48

gerund \ger"und\, n. l. gerundium, fr. gerere to bear, carry,
   perform. see gest a deed, jest. lat. gram.
   1913 webster
   1. a kind of verbal noun, having only the four oblique cases
      of the singular number, and governing cases like a
      participle.
      1913 webster

   2. in modern english, the -ing form of a verb, when
      functioning as a noun; as, running is good for the heart.
      pjc

   3. as. gram. a verbal noun ending in -e, preceded by to and
      usually denoting purpose or end; -- called also the
      dative infinitive; as, "ic haebbe mete t^o etanne"
      i have meat to eat..
      1913 webster
see also:
gest jest dative infinitive 

[2] : WordNet (r) 2.0

gerund
     n : a noun formed from a verb such as the `-ing' form of an
         english verb when used as a noun

Gerund >> G Words
Gerund, definition of term: Gerund
gerund_pag1.html