rivalry

An ongoing relationship between (usually two) rivals who compete for superiority.

The Boston Bruins have a longstanding rivalry with the Montreal Canadiens.

James and Polly have a bitter rivalry due to the latter's inclusion in the Tea Time Teaser.

The characteristic of being a rivalrous good, such that it can be consumed or used by only one person at a time.

Common goods are those which are rivalrous in consumption but non-excludable

Any competition between two or more things or factors.

Binocular rivalry is a visual phenomenon in which perception alternates between different images presented to each eye.