A line that bisects something into equal parts.
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.
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.