1. Lying in a straight line.

2. Relating to a device whose linkage produces or copies motion in straight lines.

3. Meteorology Relating to or being a powerful and often destructive wind that moves in a straight rather than circular path as the leading edge of a thunderstorm or as the result of a downburst.

4. Accounting Of or being a mode of amortization by equal payments at stated intervals over a given period of time.