Meanings
plural decels
- abbreviationclippingcolloquialcountableuncountableClipping of deceleration.
Mountainhead plays out less like a drama between four tenuously connected, very rich friends, and more like a random word generator of tech and finance bro jargon – decel (deceleration, as in AI), p(doom) (the probability of an AI apocalypse), first principles.
[2025 June 2, Adrian Horton, “Tech-bro satire Mountainhead is an insufferable disappointment”, in Katharine Viner, editor, The Guardian, London: Guardian News & Media, →ISSN, →OCLCAntonyms: e/acc
- colloquialcountableuncountableSynonym of decelerationist.
Beginning in summer 2022, such posters shared manifestos of an “e/acc” ideology squarely opposed to A.I. fearmongerers like the effective altruists and their fellow “decels” (aka “decelerationists”).
2023 November 20, Nitish Pahwa, “What the Heck Just Happened at OpenAI??”, in Slate, New York, N.Y.: The Slate Group, →ISSN, →OCLCSynonyms: decelerationist · Antonyms: e/acc
Synonyms & antonyms
nounClipping of deceleration.
Origin
Sense 2 is influenced by or derived via blend with incel.
Full word history & related roots →Cite this entry
decel. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/decel
“decel.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/decel. Accessed November 2, 2026.
WatkinsX Dictionary, s.v. “decel,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/decel.
Source: decel on Wiktionary, CC BY-SA 4.0.