midpoint

/ˈmɪdˌpɔɪnt/
noun
  1. The point at the exact center of something, such as a line, distance, or period of time.
    • The midpoint of the line segment is exactly halfway between the two ends.
    • The midpoint of the race was marked by a large banner.
    • We reached the midpoint of our road trip just outside of Denver.
  2. A point in time or process that is halfway through its duration.
    • At the midpoint of the movie, the plot took a surprising twist.
    • She felt tired at the midpoint of the marathon but pushed through.
    • The project's midpoint review helped us stay on schedule.
Antonyms
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