thirteen

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Concise Oxford English Dictionary © 2008 Oxford University Press:
thirteen/θɜːˈtiːn/
cardinal number equivalent to the sum of six and seven; one more than twelve, or seven less than twenty; 13. (Roman numeral: xiii or XIII)
– derivatives
thirteenth ordinal number.
– origin OE thrēotīene (see three, -teen).
'thirteen' also found in these Oxford entries:

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