How do you pronounce "instantaneously"?

In American English: /ˌɪnstənˈtæniːəsli/ (inst-uhn-TAN-ee-uhsl-ee). In British English: /ˌɪnstəntˈeɪniəsli/ (inst-uhnt-AYN-ee-uhsl-ee). In Canadian English: /ˌɪnstənˈtæniːəsli/ (inst-uhn-TAN-ee-uhsl-ee). In Australian English: /ˌɪnstəntˈeɪniəsli/ (inst-uhnt-AYN-ee-uhsl-ee).

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

Yes. In American English it's pronounced /ˌɪnstənˈtæniːəsli/ (inst-uhn-TAN-ee-uhsl-ee), while in British English it's /ˌɪnstəntˈeɪniəsli/ (inst-uhnt-AYN-ee-uhsl-ee).

How to Pronounce "instantaneously"

instantaneously

regional

/ˌɪnstənˈtæniːəsli/

inst-uhn-TAN-ee-uhsl-ee

Syllable Breakdown

ɪnstin·ənstan·tænta·iːne·əslous·ily

Source

80%confidence📘 CMU Pronouncing Dictionary v0.7b

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Last updated: 2026-02-14