millimeter Meaning, Definition & Usage

  1. noun a metric unit of length equal to one thousandth of a meter
    mm; millimetre.

WordNet

Mil"li*me`ter, Mil"li*me`tre noun (Also<
  • Millimeter
  • Millimetre
)
Etymology
F. millimètre; milli- milli- + mètre. See 3d Meter.
Definitions
  1. A lineal measure in the metric system, containing the thousandth part of a meter; equal to .03937 of an inch. See 3d Meter.

Webster 1913