The Collaborative International Dictionary of English v.0.48:
Rival \Ri"val\, v. t. [imp. & p. p. Rivaledor Rivalled; p.
pr. & vb. n. Rivaling or Rivalling.]
1. To stand in competition with; to strive to gain some
object in opposition to; as, to rival one in love.
2. To strive to equal or exel; to emulate.
To rival thunder in its rapid course. --Dryden.
Moby Thesaurus II by Grady Ward, 1.0:
41 Moby Thesaurus words for "rivaling":
a cut above, above, ahead, ascendant, better, capping, chosen,
competing, competitive, cutthroat, distinguished, eclipsing,
eminent, emulous, exceeding, excellent, excelling, finer, greater,
higher, in ascendancy, in competition, in rivalry,
in the ascendant, major, marked, of choice, one up on, outstanding,
over, rare, rival, super, superior, surpassing, topping,
transcendent, transcendental, transcending, upper, vying