Should I insist that Encyclopaedia has 'ae' not just an 'e' in it?

[citizenGHOSTYvich]

As it is the end of term here DS's class were allowed to choose their own words to learn for their weekly spelling test.
True to form, DS has chosen words like "communicate" and "environment" and "expectation"
Although only in Year 2 he is up to it - I think ...
BUT 3 words came home in the list written wrong but marked correct by his teacher ...
"unbelivable"
"acceptence"
and
"encyclopedia"

The first two I corrected - but had to get the dictionary out to prove to DS that I was right and his teacher was wrong ..

BUT "encyclopedia"???

I am insisting "encyclopaedia" but am aware that it is sort of ok these days in an american and australian sort of way to just have an 'e' ...

What would you do?

ellbell - i prefer ise but ise and ize appear in the uk dictionaries and again i think it is about consistency within a book/article etc

if i am asked to edit a book that will be sold in countries other than in the uk, the publisher will ask for ize spellings - it is called 'international' spelling

its already a muddle in english - size but realise - there are so many inconsistencies!

I'd like to think that the MHRA had been infiltrated by Americans (and Americanized [sic]), but a colleague of mine actually helped write the MHRA style guide (I know, I know... he's even sadder than me) and I don't think that's what has happened.