Definition of "tit-for-tat" [tit-for-tat]

• See tit. (noun)

The Century Dictionary (Public Domain)

• "Although every equilibrium is locally stable, they can differ greatly in their group-level properties e.g., all defect vs. tit-for-tat in an iterated prisoner's dilemma model."
• "Yet, despite the involvement and money of the LGBT lobbyists, including the omnipresent Human Rights Campaign, the National Gay and Lesbian Task Force and the Freedom to Marry Coalition, the marriage tit-for-tat continues in Albany."
• "Girardi says he wants to avoid tit-for-tat beanball wars."