Hallowmas definitions

hăl'ō-məs, -măs'
All Saints' Day.
noun
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noun
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(archaic) All Saints Day, November 1
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Origin of hallowmas

Short for All-hallows' mass (“All-saints' mass”), ultimately continuing Old English ealra hālgena mæsse-dæġ (literally “All Saints' mass day”), equivalent to hallow (“saint”) +‎ -mas.