Unauthorized and unauthorised are both English terms.
Unauthorized is predominantly used in 🇺🇸 American (US) English (
en-US) while unauthorised is predominantly used in 🇬🇧 British English (used in UK/AU/NZ) (
In terms of actual appearance and usage, here's a breakdown by country, with usage level out of 100 (if available) 👇:
|Term||US||UK||India||Philippines||Canada||Australia||Liberia||Ireland||New Zealand||Jamaica||Trinidad & Tobago||Guyana|
Below, we provide some examples of when to use unauthorized or unauthorised with sample sentences.
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(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license.)