Contest - When there is a competition there is a contest. This engagement is between individuals, groups, animals, etc. for territory, a niche, or a location of resources. It arises whenever two and only two parties strive for a goal which cannot be shared. Competition occurs naturally between living organisms which co-exist in the same environment. For example, animals compete over water supplies, food, mates, and other biological resources. Humans compete for water, food, and mates, though when these needs are met deep rivalries often arise over the pursuit of wealth, prestige, and fame. Business is often associated with competition as most companies are in competition with at least one other firm over the same group of customers.
All of these engagements are contests - a competition over and outcome which cannot be shared.