Definitions

1. noun

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

“The doctor measured the patient’s height to be 175 millimeters.”

2. noun

A unit of length in the metric system used to express the thickness of a material

“The fabric has a thickness of 5 millimeters.”

3. noun

A unit of length in the metric system used to express the distance between two points

“The distance between the two cities is 50 millimeters.”