Allhallowmas

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All·hal·low·mas

A0211400 (ôl′hăl′ō-məs)n. Archaic 1. All Saints' Day.2. The feast observed on All Saints' Day.
[Middle English Alhalwemesse, from Old English ealra hālgena mæsse : ealra, genitive pl. of eall, all; see all + hālgena : genitive pl. of hālga, saint (from hālig, holy; see holy) + mæsse, Mass; see Mass.]