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English to English noun
| 1 |
the act of checking or adjusting (by comparison with a standard) the accuracy of a measuring instrument |  | Example: the thermometer needed calibration
source: wordnet30
| 2 |
The process of estimating the caliber a tube, as of a thermometer tube, in order to graduate it to a scale of degrees; also, more generally, the determination of the true value of the spaces in any graduated instrument. | | source: webster1913
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