The Collaborative International Dictionary of English v.0.48:

Matchmaking \Match"mak`ing\, n.
   1. The act or process of making matches for kindling or
      burning.
      [1913 Webster]

   2. The act or process of trying to bring about a marriage for
      others.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Matchmaking \Match"mak`ing\, a.
   Busy in making or contriving marriages; as, a matchmaking
   woman.
   [1913 Webster]

WordNet (r) 3.0 (2006):

matchmaking
    n 1: mediation in order to bring about a marriage between others