- 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.
Meaning of 'calibration' (Princeton's WordNet)
1 . calibration
[ n]
Meaning (1): - the act of checking or adjusting (by comparison with a standard) the accuracy of a measuring instrument