@drbjork I have heard people say that in British English 'inquiry' is for a legal process, and 'enquiry' for just trying to find something out.
I found this which repeats that, but also says that some people treat them as variant spellings: https://en.wiktionary.org/wiki/inquiry#Alternative_forms
I think of them as variant spellings.
The philosophy journal uses an 'I': https://www.tandfonline.com/toc/sinq20/current
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