Meaning of calibrate

cal•i•brate

1. to determine, check, or rectify the graduation of (any instrument giving quantitative measurements).
2. to divide or mark with gradations, graduations, or other indexes of degree, quantity, etc., as on a thermometer, measuring cup, or the like.
3. to determine the correct range for (an artillery gun, mortar, etc.) by observing where the fired projectile hits.
4. to plan or devise (something) carefully so as to have a precise use, application, appeal, etc.: a sales strategy calibrated to rich investors.