Longman Dictionary of Contemporary English homepage

calibration

 noun
     
Related topics: Measurement
cal‧i‧bra‧tion [uncountable] technical
1 the process of checking or slightly changing an instrument or tool so that it does something correctly:
the calibration of flight instruments
2TM a set of marks on an instrument or tool used for measuring, or the act of making these marks correct
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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