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