phenomenon

/fəˈnɑmənɑn/
noun
  1. A fact or event that can be observed and studied, especially one that is unusual or interesting.
    • Scientists are studying the phenomenon of birds migrating thousands of miles.
    • The northern lights are a beautiful natural phenomenon.
    • The sudden popularity of the game was a cultural phenomenon.
  2. A remarkable person, thing, or event.
    • Her rise to fame was a phenomenon no one predicted.
    • The young pianist was a phenomenon, playing concertos at age six.
    • The internet itself is a phenomenon that changed the world.