Definition of "centerline" [centerline]

• A line that bisects something into equal parts. (noun)
• 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. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Negative offset means the centerline is outboard of the mounting surface; positive offset means the centerline is inboard of the mounting surface."
• "Zero offset means the rim centerline is in line with the mounting surface."
• "Centerlines have been used as the starting point in the past, the reason beign, the centerline is the common element between the right and the left."