Posterity/pɑːˈsterəti/ Definition 1 of 2Pro Tip 1/3Beyond Lifetimes Refers to people in the distant future, beyond anyone currently alive. This time capsule will tell posterity about our era. Pro Tip 2/3Responsibility Implication Often used to express a sense of duty to future generations. We are conserving these resources for posterity. Pro Tip 3/3Historical Context Used when considering the judgment or view of future generations. The president's decisions will be judged by posterity.