verb (used with object), cal·i·brat·ed, cal·i·brat·ing.

  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.

verb (tr)

  1. to measure the calibre of (a gun, mortar, etc)
  2. to mark (the scale of a measuring instrument) so that readings can be made in appropriate units
  3. to determine the accuracy of (a measuring instrument, etc)
  4. to determine or check the range and accuracy of (a piece of artillery)

1839, verb formed from caliber + -ate (2). Related: calibrated; calibrating.


  1. To check, adjust, or determine the graduations of a quantitative measuring instrument by comparison with a standard.
  2. To determine the caliber of a tube.
  3. To make corrections in or adjust a procedure or process.

  1. To check, adjust, or standardize a measuring instrument, usually by comparing it with an accepted model.
  2. To measure the diameter of the inside of a tube.
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