How do you pronounce "octillion"?

In American English: /ɑːkˈtɪljən/ (ahk-TILY-uhn). In British English: /ɒktˈɪliən/ (okt-IL-ee-uhn). In Canadian English: /ɑːkˈtɪljən/ (ahk-TILY-uhn). In Australian English: /ɒktˈɪliən/ (okt-IL-ee-uhn).

Is "octillion" pronounced differently in American and British English?

Yes. In American English it's pronounced /ɑːkˈtɪljən/ (ahk-TILY-uhn), while in British English it's /ɒktˈɪliən/ (okt-IL-ee-uhn).

How to Pronounce "octillion"

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octillion

regional

/ɑːkˈtɪljən/

ahk-TILY-uhn

Syllable Breakdown

ɑːkoc·tɪljtil·ənlion

Source

80%confidence📘 CMU Pronouncing Dictionary v0.7b

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Last updated: 2026-02-14