Definitions

1. noun

A unit of length in the metric system, equal to one-thousandth of a meter.

“The engineer measured the distance to the object using a milimeter ruler.”

2. noun

A device for measuring distances in milimeters.

“The photographer used a milimeter scale to set up the shot.”

3. noun

A device for measuring angles or directions in miliradians.

“The military used a milimeter sight to target the enemy.”