Definition from Wiktionary, the free dictionary
- Realisation or understanding of the significance and nature of events after they have occurred
- When you read "Seven Little Rabbits" at age 6 and read it again 15 years later, the hindsight you've developed in the time between will make you look at and think of the book much differently than you did the first time!
- The rear sight of a firearm
after-the-fact realisation or understanding