I've seen ''millioneth'' a few times in older books. Dictionaries seem to all say ''millionth''. Is ''millioneth'' simply incorrect or could it be that it is an old non-standard spelling.

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    The word millionth is an ordinal number derived from a cardinal number ending in "n" just like ninth, tenth, eleventh, thirteenth and so on. According to The Online Etymology Dictionary and other online sources the word "million" was adopted from French "million" (spelt the same but pronounced differently) around the 16th century and the French word was derived from the Italian "millione". It is possible that some people thought that "million" came from "millione" and, therefore, spelt it with an 'e' but no one does that now. – BoldBen Oct 20 '18 at 11:15
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    Prior to maybe 1850 there was no standard spelling. – Hot Licks Oct 20 '18 at 11:54

If you try Google nGrams then millioneth certainly looks much rarer than millionth, probably enough now to be described as incorrect

If you do a Google book search for the 17th and 18th centuries (not totally reliable), millioneth was less common than millionth, though both seen relatively rare. At that stage they might have been seen as variants, with millionth later dominating

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