#1 calibrate v. [graduate, fine-tune] make fine adjustments or divide into marked intervals for optimal measuring; "calibrate an instrument"; "graduate a cylinder". wn
#2 calibrate v. mark (the scale of a measuring instrument) so that it can be read in the desired units; "he calibrated the thermometer for the Celsius scale". wn
#3 calibrate v. measure the caliber of; "calibrate a gun". wn
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