brainstorm

Etymology

It is formed from English brain + storm,^[2][3][4][5] with storm in its medical sense of a paroxysm or violent intensifying of a disease, recorded since the 1540s.^[3] For the sense of a bright idea the OED compares brainwave.^[2] Brain is from Old English brægen, and storm is from Old English storm (“tempest; onrush, tumult”).^[3]

Earliest recorded meaning

A fit of rage or melancholy, a sudden change of mood, or a sudden severe attack of mental illness: 1861, in S. B. Hemyng's Dark Cloud with Silver Lining.^[2][4][3] Dictionary.com dates the word to 1890–95, originally for a severe mental disturbance.^[5]

Semantic evolution

Etymonline describes the early colloquial sense as a fit of acute mania, a sudden overthrow of reason under strong emotion, usually with violence.^[3] According to Popik, brainstorm was the catchword of the 1907 trial of Harry Kendall Thaw for the killing of the architect Stanford White, after a doctor testified that Thaw suffered from "brainstorms", and it entered general use almost at once.^[6] In American colloquial use from 1925 it also meant a sudden bright idea,^[2][7] a sense Etymonline dates from 1934 and derives from the earlier one, quoting a 1936 article in Popular Mechanics on radio's "brainstorm boys".^[3] From the same sense came that of a concerted, originally American, attempt to solve a problem by a group discussion of spontaneous ideas,^[2] which brainstorming had in this sense from 1907.^[2] The verb, from the noun or a back-formation from brainstorming, is recorded from 1945,^[2] and by 1947 in Etymonline.^[3] Merriam-Webster also has a harebrained idea, and Collins a sudden mental lapse in informal British use.^[4][8]

Timeline

• 1861 – a fit of rage or a sudden attack of mental illness.^[2][4]
• 1925 – a sudden bright idea (US colloquial).^[2][7] Etymonline dates this sense to 1934.^[3]
• 1945 – verb, to analyse a problem in a group discussion of spontaneous ideas.^[2] Etymonline dates the verb to 1947.^[3]

Meanings

Noun

1. A sudden clever idea; a brainwave: Then she had a brainstorm and called the plumber's cousin.^[4][8][2]
2. A session of group discussion in which ideas are put forward freely to solve a problem.^[8][2]
3. A harebrained or impractical idea.^[4]
4. A sudden violent disturbance of the mind; a fit.^[4][8][2]
5. (British, informal) A sudden mental lapse.^[8]

Verb

1. To discuss a problem in a group, putting forward ideas freely; to hold a brainstorming session.^[8][2]

Word family

• brainstormer

Related words

• brainstorming
• brainwave
• brain
• storm

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j k l m n Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d e f g h i Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
4. ^ a b c d e f g Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
5. ^ a b Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
6. ^ Popik, Barry, The Big Apple, barrypopik.com, p. "Brainstorm", 15 June 2005
7. ^ a b Dalzell, Tom; Victor, Terry, eds. (2013), The New Partridge Dictionary of Slang and Unconventional English, 2nd ed., London: Routledge
8. ^ a b c d e f Collins English Dictionary (2023), Glasgow: HarperCollins