1. The title, subtitle, or topic that stands at the top or beginning, as of a paragraph, letter, or chapter.
2. The course or direction in which a ship or aircraft is moving.
3. 1. A gallery or drift in a mine.
   2. The end of a gallery or drift.

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.