QIMT Glossary

Definitions of Metrology terms & phrases.

If you know of a term or phrase that belongs here, you can submit the term or phrase and associated definition by adding an entry. NOTE: All entries are reviewed and approved prior to being seen by others on the site.

Procedure for adding a Definition:

  1. Click on the "Add a New Entry" button.
  2. Under the first required field labeled 'Concept', enter the Metrology word or term.
  3. In the 'Description' Field, put the definition, don't forget to use the "DeWord" button to remove MS Word formatting if you are copying and pasting from MS Word; see lounge forum for note regarding this issue.
  4. Ignore the other entries and submit.

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Technical Barrier to Trade.


Technical procedure consisting of the determination of one or more characteristics of a given product, process service, in accordance with a specified procedure.

Threshold, resolution capability (discrimination)

Largest change in a stimulus that produces no detectable change in the response of a measuring instrument, the change in the stimulus taking place slowly and monotonically.


Property of the result of a measurement or the value of a standard whereby it can be related to stated references, usually national or international standards, through an unbroken chain of comparisons all having stated uncertainties.

Traceability chain

The unbroken chain of comparisons is defined under Traceability.

Transfer equipment

The description “transfer equipment” should be used when the intermediate link is not a standard.

Transfer standard

Standard used as an intermediary to compare standards.

Travelling standard

True value (of a quantity)

The indefinite form rather than the definite form is used in connection with true value, in that there can be many values that are consistent with the definition of a particular quantity.