1. one thousandth of a degree, used as a unit of measurement for temperature or angular measurement
Usage: technical; scientific

Examples

• The thermometer can measure temperature changes as small as a few millidegrees.
• The satellite’s orientation was adjusted by 50 millidegrees.
• Laboratory equipment detected a temperature variation of 3 millidegrees.
• The telescope’s positioning system is accurate to within 10 millidegrees.
• Scientists recorded temperature fluctuations of less than one millidegree.
• The instrument calibration required precision to the millidegree level.