1. A significant or memorable occurrence that marks an important point in time or represents a turning point in history, progress, or personal experience
The moon landing was a landmark event in human history.
O pouso na lua foi um evento marcante na história da humanidade.
2. An occasion or happening that is notable enough to be remembered as a milestone or major achievement
Her graduation was a landmark event in her family's life.
Sua formatura foi um evento marcante na vida de sua família.