- The relationship between two or more rivals who regularly compete with each other. The term usually applies to two rivals.
- The Boston Bruins have a longstanding rivalry with the Montreal Canadiens.
- In economics, rivalry is a characteristic of a good. Rivalrous goods are those which can be consumed by only one person at the same time -- for example, a candy bar or a suit; a non-rivalrous good may be provided to more consumers at a very low marginal cost for each additional consumer.
unknown, Department of Economics, University of Pittsburgh, at Johnstown, “Public Goods”, in (Please provide the book title or journal name), retrieved 2013-12-02:
Common goods are those which are rivalrous in consumption but non-excludable