midpoint
US /ˈmɪd.pɔɪnt/
UK /ˈmɪd.pɔɪnt/

1.
the exact middle point of a line segment or a period of time
:
•
The midpoint of the line segment is (3, 5).
•
We're at the midpoint of the project, so we need to review our progress.
the exact middle point of a line segment or a period of time