state of two people or groups engaging in a lasting competitive relationship
Rivalry is a relationship between two or more individuals who regularly compete with one another.
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- He who ignores a rival, does not get to eat everything up, like the bull which ignores the bull at its side. But he who acknowledges a contest can be the outright winner, like the bull which acknowledges the bull at its side.
- Enmerkar and the Lord of Aratta, Neo-Sumerian period (ca. 21st century BCE). 
- Rivalry and personal vanity should have no place among you, but you should humbly reckon others better than yourselves. You must look to each other's interest and not merely to your own.
- Paul of Tarsus, Epistle to the Philippians 2:3-4, as translated in The Cambridge Bible Commentary by Kenneth Grayston (1967), p. 20