calibration

noun

1. the act of checking or adjusting (by comparison with a standard) the accuracy of a measuring instrument

   noun.act

   Examples

   The thermometer needed calibration.

   Synonyms standardisation standardization

   Source: WordNet 3.0

2. The process of estimating the caliber a tube, as of a thermometer tube, in order to graduate it to a scale of degrees; also, more generally, the determination of the true value of the spaces in any graduated instrument.

   noun

   Source: webster1913