acoustics

Etymology

It is formed from English acoustic + -ics,^[2][3][4] or, in the OED's analysis, from the adjective used as a noun, like other names of sciences in -ics.^[5] The OED compares post-classical New Latin acoustica (“acoustic art”) (1623, in a British source) and French acoustique, used as a noun for the science from 1700.^[5] The adjective is from French acoustique,^[4][6] and through post-classical acusticus^[5] from Ancient Greek ἀκουστικός (akoustikós, “of or for hearing”),^[5][4][6] from ἀκουστός (akoustós, “heard, audible”),^[5][4][6] from ἀκούειν (akoúein, “to hear”),^[5][4][6] probably from the same Indo-European base as hear.^[5][4][6]

Earliest recorded meaning

The science of sound: 1684, in the Royal Society's Philosophical Transactions.^[5][2] Merriam-Webster's Collegiate and the 1989 edition of the OED give 1683,^[7][8] Etymonline the 1680s^[4] and Dictionary.com 1675–85.^[3]

Semantic evolution

As the name of the science, a branch of physics, the word takes a singular verb.^[5][9] The sense "the sound qualities of a room or building", which takes a plural verb, is recorded from 1835 in the revised OED;^[5] Etymonline and the 1989 edition of the OED dated it to 1885.^[4][8] In this sense Merriam-Webster also allows the singular acoustic.^[2][7] The 1989 edition of the OED also recorded acoustics as the plural of acoustic in the sense of a medicine for the hearing.^[8]

Timeline

• 1684 – the science of sound.^[5][2]
• 1835 – the sound qualities of a room or building.^[5] Etymonline dates this sense to 1885.^[4]

Meanings

Noun

1. (with a singular verb) The branch of physics that deals with sound: how it is produced, transmitted and received, and its effects, including hearing: Acoustics is a required course for audio engineers.^{[9][2][5][10]}
2. (with a plural verb) The qualities of a room, hall or other space that determine how well sound is carried and heard in it, such as its reverberation: The acoustics in the old chapel are superb.^{[9][2][5][10]}

Word family

• bioacoustics
• electroacoustics
• psychoacoustics
• radioacoustics

Related words

• acoustic
• hear

Usage notes

Until the 1880s dictionaries gave only the pronunciation /əˈkaʊstɪk/ for acoustic; the form with /uː/ then gained ground and became usual in the early 20th century, and by the late 20th century the older form was labelled old-fashioned.^[5]

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
3. ^ a b Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
4. ^ a b c d e f g h i Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
5. ^ a b c d e f g h i j k l m n o Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
6. ^ a b c d e Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
7. ^ a b Merriam-Webster's Collegiate Dictionary (2003), 11th ed., Springfield, Mass.: Merriam-Webster
8. ^ a b c Simpson, J. A.; Weiner, E. S. C., eds. (1989), The Oxford English Dictionary, 2nd ed., Oxford: Clarendon Press
9. ^ a b c Collins English Dictionary (2023), Glasgow: HarperCollins
10. ^ a b The American Heritage Dictionary of the English Language (1992), 3rd ed., Boston: Houghton Mifflin