centerline

/ˈsɛntərˌlaɪn/
noun
  1. A real or imaginary line that divides something into two equal halves, often used for alignment or measurement.
    • The architect drew a centerline down the blueprint to mark the middle of the building.
    • The pilot kept the plane on the runway's centerline during landing.
    • The road has a yellow centerline to separate traffic going in opposite directions.
Antonyms
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