One who attempts to equal or surpass another, or who pursues the same object as another; a competitor. One that equals or almost equals another in a particular respect. Obsolete A companion or an associate in a particular duty. To attempt to equal or surpass. To be the equal of; match: "They achieved more than they had ever dreamed, lending a magic to their family story that no tale or ordinary life could possibly rival\u201d ( Doris Kearns Goodwin). To be a competitor or rival; compete.