An archaic term for All Saints' Day and the season around it, combining 'hallow' with 'mass' (the Christian service).
From 'hallow' (holy) combined with 'mass' (religious service), a Medieval English term for the feast day dedicated to all saints.
'-mas' words like 'Hallowmas' and 'Christmas' preserve the old English way of naming holy days—we've abandoned this pattern except for a handful of holiday fossils.
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