The Collaborative International Dictionary of English v.0.48:

follow-on \follow-on\ n.
   an immediate second innings forced on a cricket team scoring
   a prescribed number of runs fewer than its opponents in the
   first innings.
   [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

follow-on \follow-on\ a.
   Following as a logical consequence or next step in a process;
   -- used mostly of voluntary actions.
   [PJC]

WordNet (r) 3.0 (2006):

follow-on
    n 1: an immediate second innings forced on a cricket team
         scoring a prescribed number of runs fewer than its
         opponents in the first innings