An archaic or variant spelling of 'heyday,' meaning the period of greatest success, popularity, or vitality for a person or thing.
An older or variant orthography of heyday, possibly influenced by the 'heigh' interjection; the modern 'heyday' likely derives from 'hey' plus 'day,' meaning a time of celebration.
The spelling 'heighday' appears in early printed books and reveals how English spelling wasn't standardized until the 18th century—printers made different choices about whether to write 'heighday,' 'heyday,' or 'hayday.'
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