- a combining form meaning “thousand” (millipede): in the metric system, used in the names of units equal to one thousandth of the given base unit (millimeter).
prefix
- denoting 10 –3millimetre Symbol: m
word-forming element meaning “thousandth part of a metric unit,” from comb. form of Latin mille “thousand” (see million). pref.
- One thousandth (10-3):millisecond.
- A prefix that means one thousandth, as in millimeter, one thousandth of a meter.