01 n. The first day of May (Old Style).
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1.
The first day of May (Old Style).“The quarter-days anciently in Scotland were Hallowmas, Candlemas, Beltane, and Lammas.” — New English Dict.
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2.
A festival of the heathen Celts on the first day of May, in the observance of which great bonfires were kindled. It still exists in a modified form in some parts of Scotland and Ireland.