We just wrapped up our summer intern cycle at ConAgra Foods , and I noticed a pattern in the final presentations. All the presentations I observed used the words "Acknowledgements." According to the dictionary, this is the British spelling of the word. If you're going to add that extra e, then you might as well put a discussion of the latest rumours on your "shed-yule".
I suspect that this British spelling slips by because the base word is spelled acknowlege acknowledge, and the extra e doesn't look out of place the way that extra u in rumours does to American eyes.
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