autumn

noun
  1. The season of the year between summer and winter, during which the weather becomes cooler and many trees shed their leaves, typically characterized by a transition from the warmth of summer to the cold of winter. noun
    The leaves turn vibrant shades of red, orange, and yellow in autumn.
    Autumn is a popular time for harvest festivals and enjoying the crisp, cool air.
  2. A period of maturity or decline, often used metaphorically to describe the later stages of life or a process. noun
    He entered the autumn of his career, reflecting on his past achievements.
    The company is in the autumn of its existence, focusing on legacy and transition.