competitor

plural competitors · alternative competitour

1. A person or organization against whom one is competing.

   Hitherto the river had given facilities to Kingston traders which their competitors elsewhere could not possess, but now the railway took the malt from distant towns to the London market at lower rates than the bargemasters.

   1958 July 28, J. Spencer Gilks, “Railway Development at Kingston-upon-Thames—1”, in Railway Magazine, page 449

   Synonyms: adversary, opponent

2. A participant in a competition, especially in athletics.

   Synonyms: contestant

3. obsoletePartner, associate, one working with another toward a common goal.

   Ioine with me now in this my meane eſtate, […] And when my name and honor ſhall be ſpread, As far as Boreas claps his braſen wings, Or faire Botëes ſends his cheerefull light. Then ſhalt thou be Competitor with me, And ſit with Tamburlaine in all his maieſtie.

   c. 1587–1588 (date written), [Christopher Marlowe], Tamburlaine the Great. […] The First Part […], 2nd edition, part 1, London: […] [R. Robinson for] Richard Iones, […], published 1592, →OCLC; reprinted as Tamburlaine the Great (A Scolar Press Facsimile), Menston, Yorkshire; London: Scolar Press, 1973, →ISBN, Act I, scene ii