calibrate

Etymology

It is formed from English calibre + -ate,^{[2][3][4][5][6][7][8]} and the OED compares French calibrer.^[2] Klein calls it a hybrid of calibre with a suffix of Latin origin.^[7] Calibre itself is from French calibre, often said to go back ultimately to an Arabic word for a mould, a derivation that Etymonline reports as disputed.^[3]

Earliest recorded meaning

To determine the calibre of something: 1839 according to Etymonline.^[3] The OED's first quotation, of 1852, is for testing the bore of a thermometer tube so as to allow for its irregularities when graduating it.^[2][4]

Semantic evolution

From measuring the bore of a tube, the verb passed in the 1860s to setting the scale of any measuring instrument: the OED records from 1863, in Tyndall's Heat, the sense of determining the correct value or position of something and setting an instrument so that its readings are absolute, and Etymonline dates "to determine the relative value of the parts of a scale" to 1869.^[2][3] Merriam-Webster Unabridged now labels the original sense of finding the calibre obsolete, and adds the artillery sense of finding by actual firing the corrections needed in range or elevation.^[6] The Concise Oxford adds the adjustment of experimental results so that they can be compared with other data.^[9]

Timeline

• 1839 – to determine the calibre of something.^[3] Merriam-Webster Unabridged dates this sense to about 1864, and Dictionary.com the word to 1860–65.^[6][8]
• 1852 – to test the bore of a thermometer tube before graduating it.^[2]
• 1863 – to determine the correct value or position of something; to set an instrument so that it gives absolute readings.^[2] Etymonline dates the sense of valuing the parts of a scale to 1869.^[3]

Meanings

Verb

1. To check or adjust a measuring instrument by comparing its readings with a standard: The technician calibrated the scales every morning.^[6][10][9]
2. To mark the scale or graduations of a measuring instrument.^[10][6][8]
3. To determine the range and the corrections needed for a piece of artillery.^[10][6][8]
4. To adjust experimental results so that they allow for outside factors or can be compared with other data.^[9]
5. To measure the calibre of a gun or the bore of a tube.^[10][2]

Word family

• calibrator
• calibration
• recalibrate

Related words

• calibre

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d e f Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
4. ^ a b Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
5. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
6. ^ a b c d e f Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
7. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
8. ^ a b c d Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
9. ^ a b c Soanes, Catherine; Stevenson, Angus, eds. (2004), Concise Oxford English Dictionary, 11th ed., Oxford: Oxford University Press
10. ^ a b c d Collins English Dictionary (2023), Glasgow: HarperCollins