1. Lying in a straight line.
2. Relating to a device whose linkage produces or copies motion in straight lines.
3. Accounting. Of or being a mode of amortization by equal payments at stated intervals over a given period of time.

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.