Plural of calibration; the acts or processes of adjusting measuring instruments to ensure they give accurate results.
From calibrate plus the noun suffix -ion (meaning 'act of' or 'state of'), with the Latin root meaning standardization. The term became prominent in scientific and technical fields during the 19th century.
NASA spends millions of dollars and thousands of hours doing calibrations because a tiny error in a space probe's instruments could mean landing on the wrong asteroid or missing a planet entirely!
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