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” ( Doris Kearns Goodwin).