An archaic or obsolete variant spelling of 'old,' or a dialectal term used in some English-speaking regions.
From Middle English alde, from Old English eald. The word represents an older spelling convention before standardization, appearing in historical texts and some regional dialects.
Early English had lots of different ways to spell 'old'—ald, olde, ould—before people decided on one correct version. That's why you see 'Ye Olde Shoppe' on tourist attractions!
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