What does metrology mean?
Metrology is the science of measurement. It studies how quantities such as length, mass, temperature, time, and electrical properties are defined, measured, and expressed through reliable units and standards. The field also examines measurement methods, instrument calibration, traceability, and uncertainty. Metrology is important in science and engineering because accurate measurements support research, quality control, safety, navigation, manufacturing, and international trade. It is also responsible for maintaining the reference standards that allow measurements made in different places and times to be compared reliably. In everyday writing, “metrology” is more precise than the general word “measurement,” since it emphasizes the scientific and technical foundations of measuring. Its name reflects this focus: the element “metr-” derives from Greek metron, meaning “measure,” while “-logy” refers to the study of something.
nounThe science concerned with measurement, especially the definitions, methods, standards, and units used to make precise measurements.
- The science and practice of measurement, including the study of measurement units, standards, methods, and traceability.
"Advances in metrology have made it possible to measure distances with unprecedented precision."
"The national metrology institute maintains the standards used to calibrate measuring equipment."
"Her work in optical metrology improved the accuracy of instruments used in semiconductor manufacturing."
The word is normally used as a mass noun for the field of study. The plural is grammatical but uncommon.
"The conference brought together specialists from several branches of metrology."
Metrology is the discipline that turns “about right” into a measurable result.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does metrology come from?
Metrology comes through French métrologie from Greek metrologia, a compound of metron, meaning “measure,” and -logia, meaning “study” or “science.” English borrowed the word in the early modern period for the systematic study of measurement. Its relatives include metric, metre, and meter, all of which ultimately reflect the same Greek root.
Related word forms
How metrology is actually used
A specialist and usually formal term. It refers to measurement science broadly, not merely the act of measuring; in technical contexts it includes units, calibration, traceability, and measurement uncertainty.