competitor
n.-
1 business or market rival (n.) B1 Intermediatea company or person that sells the same products or services as you and tries to win the same customers.
a commercial entity or individual offering similar products or services within the same market, competing for market share.
ExampleThe company lowered its prices to stay ahead of its main competitor.
ExampleThe tech giant acquired several smaller competitors to consolidate its dominance in the emerging cloud computing market.
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2 sports or contest participant (n.) B1 Intermediate Sportsomeone who takes part in a race, a game, or a competition.
an individual or team participating in a structured contest, particularly in an athletic or professional context.
ExampleOver two hundred competitors entered the marathon this year.
ExampleEach competitor underwent rigorous drug testing before being cleared to participate in the final round of the championship.
Borrowed from Middle French compétiteur, from Latin competitor.