Allhallowmas can be superficially analyzed as a combination of all + hallow ("saint, holy person") + -mas ("mass, church festival, holiday" as in Christmas), but it's actually a direct descendant of the Middle English and Old English terms for All Saints' Day, whose parts mean the same as in the modern expression: (Middle English Alhalwemesse) and Old English ealra hālgena mæsse (literally "the mass of all the saints", from eall, halga, and mæsse).
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