1. 
[syn: intercede, mediate, intermediate, liaise, arbitrate]
The Collaborative International Dictionary of English v.0.48:
liaise \li*aise"\ (l[=e]*[=a]z"), v. i. [By back-formation from
   liaison.]
   1. To form or maintain a liaison[3].
      [1913 Webster]
   2. To act as a liaison[4].
      [PJC]
WordNet (r) 3.0 (2006):
liaise
    v 1: act between parties with a view to reconciling differences;
         "He interceded in the family dispute"; "He mediated a
         settlement" [syn: intercede, mediate, intermediate,
         liaise, arbitrate]