@alchemage i am curious as to why you quote the oxford english dictionary instead of an etymylogical source...
Heres the etymology of the word spell from an online source as a reference.
https://www.etymonline.com/word/spell
Keep on dabbing and sharing brother
Good question, @belfastshaman.
Language is extremely fluid, consisting of many working parts. Etymology is just one of these portions of understanding language. So when recognizing a word, I find it important to pay attention to not only the etymology but also it's evolved usage and varied meanings. Thank you for bringing up the etymology!