This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A line that bisects something into equal parts.

n. A painted line running along the center of a road or highway that divides it into two sections for traffic moving in opposite directions, or, in the case of a divided highway, for lines of traffic moving in the same direction at different speeds.

n. A line that divides a shape into equal pieces.

n. a line that bisects a plane figure

"Negative offset means the centerline is outboard of the mounting surface; positive offset means the centerline is inboard of the mounting surface."

line   

center-line    girder    coordinate    scrollbar    angulation