How do you pronounce "extension"?

In American English: /ɪkˈstɛnʃən/ (ik-STEHNSH-uhn). In British English: /ɪkstˈɛnʃən/ (ikst-EHNSH-uhn). In Canadian English: /ɪkˈstɛnʃən/ (ik-STEHNSH-uhn). In Australian English: /ɛkstˈɛnʃən/ (ehkst-EHNSH-uhn).

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

Yes. In American English it's pronounced /ɪkˈstɛnʃən/ (ik-STEHNSH-uhn), while in British English it's /ɪkstˈɛnʃən/ (ikst-EHNSH-uhn).

How to Pronounce "extension"

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extension

/ɪkˈstɛnʃən/

ik-STEHNSH-uhn

Syllable Breakdown

ɪkex·stɛnʃten·ənsion

Source

90%confidence📘 CMU Pronouncing Dictionary v0.7b

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Last updated: 2026-02-14