Related Clues:

• Equal volume is central to currency
• Competitor; be as good as
• Competing opponent
• Challenger maintaining velocity during Earth's rotation
• Lakers, to Celtics, e.g
• One in a love triangle, maybe
• Adversary]
• Try to equal one's opponent
• In war I valiantly seek adversary
• The Eagles, to the Giants
• Match in ability
• One to vie with
• Main competitor
• Avis, to Hertz
• Fischer, to Spassky, e.g