calibration
C1Substantiv/US /kˌæləbrˈeɪʃən/ kăl-əbr-ĀSH-ən; UK /kˌæləbrˈeɪʃən/ kăl-əbr-ĀSH-ən/
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.
