From rival +‎ -ry.

• (US, UK) IPA^(key): /ˈɹaɪ.vəl.ɹi/

• Audio (US):

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rivalry (countable and uncountable, plural rivalries)

1. 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.

2. (economics) 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

   • 2013 December 2 (last accessed), Department of Economics, University of Pittsburgh, at Johnstown, “Public Goods”, in (Please provide the book title or journal name)‎^[1], archived from the original on 5 May 2015:
3. 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.