The act of bringing together two parties together for a relationship of mutual interest to the parties. One who arranges or tries to arrange marriages. The hopefull consequence of the effort of any person or entity with a "cupid" complex.
A backend system process that matches players (randomly, or by region or ability, etc) in order for them to play against each other online.
Matchmaking is any process of introducing people for the purposes of dating and mating, usually in the context of marriage.