oscillator

Etymology

It is formed from English oscillate + -or,^[1][2] an agent noun in Latin form;^[2] Merriam-Webster and Dictionary.com call it New Latin, built on the Latin past participle ōscillātus with the suffix -or.^[3][4][5] Oscillate is from Latin ōscillō (“to swing”), from ōscillum (“a swing, something that moves to and fro”),^[1][6] which is of unknown origin;^[1][6] the OED reports a suggestion that it is the same word as ōscillum "a small face", a mask hung to swing in the breeze, from ōs (“mouth”).^[1]

Earliest recorded meaning

A person who wavers in action or opinion: 1798, in a piece by S. T. Coleridge in the Cambridge Intelligencer.^[1][3] The 1989 edition of the OED and Etymonline had this figurative use of people only from 1835.^[7][2]

Semantic evolution

From the waverer the word passed to things: anything that swings to and fro, or any system that oscillates, from 1849.^[1] In 1889 it was applied to an apparatus generating oscillating electric currents,^[1][2] later also to electromagnetic waves and to devices producing sound,^[1] and Collins and Merriam-Webster Unabridged now put the electrical sense first.^[8][3] In the early days of radio, from 1927, an oscillator was also a person who caused or allowed a radio set to transmit radio waves; this use is now rare.^[1] Merriam-Webster Unabridged also records an instrument that measures rigidity by the twisting oscillations of a weighted wire.^[3]

Timeline

• 1798 – a person who wavers in action or thought.^[1][3]
• 1849 – something that moves to and fro; an oscillating system.^[1]
• 1889 – an apparatus generating oscillating electric currents.^[1][2]
• 1927 – a person whose radio set transmits waves and interferes with reception (now rare).^[1]

Meanings

Noun

1. An electronic circuit or device that produces an alternating current or voltage of a chosen frequency, especially a radio-frequency or audio-frequency generator: The synthesizer's sound starts from a single oscillator.^[8][3][1]
2. Any device or system that produces oscillations or moves to and fro.^[8][1]
3. An instrument that measures rigidity by the twisting oscillations of a weighted wire.^[3]
4. A person who vacillates; a waverer.^[8][1][3]

Related words

• oscillate
• oscillation
• oscillatory
• oscilloscope

References

1. ^ a b c d e f g h i j k l m n o p q r Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
2. ^ a b c d e Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
3. ^ a b c d e f g h Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
4. ^ Gove, Philip Babcock, ed. (1961), Webster's Third New International Dictionary of the English Language, Unabridged, Springfield, Mass.: G. & C. Merriam
5. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
6. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
7. ^ Simpson, J. A.; Weiner, E. S. C., eds. (1989), The Oxford English Dictionary, 2nd ed., Oxford: Clarendon Press
8. ^ a b c d Collins English Dictionary (2023), Glasgow: HarperCollins