1. Athletic activity involving vaulting, jumping, somersaults and other acrobatic movements to negotiate obstacles; usually performed in an urban area using street architecture, jumping between buildings, etc.

Encyclopedia: Free running

• irreversibility
• irreversible
• irreversible process
• irreversibly
• irrevocability
• irrevocable
• irrevocableness
• irrevocably
• irrevokable
• irridenta
• irridentism
• irridentist
• irrigate
• irrigation
• irrigation ditch
• irritability
• irritable
• irritable bowel syndrome
• unproblematic
• unprocessed
• unprocurable
• unproductive
• unproductively
• unproductiveness
• unprofessional