1)adjusting an instrument to ensure its measurements are accurate and reliable. This often involves comparing the instrument’s readings to a known standard and making necessary adjustments to correct any deviations., 2)adjust or correct. Example sentence: 1) Place the thermometer in the ice bath and check the reading. It should read 0°C. If it doesn’t, CALIBRATE the thermometer according to the manufacturer's instructions. 2)The organization calibrated their funds to ensure that they were prepared for the future.