A misspelling or archaic variant of distinction; the recognition of difference or special merit.
This appears to be an obsolete or variant spelling of 'distinction' from Middle English or early modern English, when spelling was less standardized.
Before dictionaries standardized spelling, scribes wrote 'distintion' interchangeably with 'distinction'—finding archaic spellings in old texts reveals how spelling conventions weren't set until the printing press arrived in the 1450s.
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