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14th century, in the meaning defined above
Middle English Alhalwemesse, Alhalowmesse, from Old English ealra halgena mæsse, literally, all saints' mass
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“Allhallowmas.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Allhallowmas. Accessed 7 Jul. 2022.
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