What is the meaning of Revenge?

Any form of personal, retaliatory action against an individual, institution, or group for some alleged or perceived harm or injustice.

A win by a previous loser.

To take revenge for (a particular harmful action) or on behalf of (its victim); to avenge.

To take one's revenge (on or upon someone).

To take vengeance; to revenge itself.

Source: wiktionary.org