versus

Against; in opposition to.

• It is the Packers versus the Steelers in the Super Bowl.

Compared with, as opposed to.

• In polling by the Pew Research Center in November 2008, fully half the respondents thought the two parties would cooperate more in the coming year, versus only 36 percent who thought the climate would grow more adversarial.
• If, for example, we select random people entering a workout gym, versus if we pick random people entering a hospital, we will get very different samples.

Bringing a legal action against, as used in the title of a court case in which the first party indicates the plaintiff (or appellant or the like), and the second indicates the defendant (or respondent or the like).

• Brown v. Board of Education of Topeka, Kans.

Interacting with, especially to record reactions

Mashed up with.

• Kiss Me Thru The Phone vs. Last Friday Night

Indicating one group or artist remixing another.

• The Auteurs vs. μ-Ziq

To face in competition

To fight