eighty

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Concise Oxford English Dictionary © 2008 Oxford University Press:
eighty/ˈeɪti/
cardinal number (pl. eighties) equivalent to the product of eight and ten; ten less than ninety; 80. (Roman numeral: lxxx or LXXX)
– derivatives
eightieth ordinal number,
eightyfold adjective & adverb.
– origin OE hunde(a)htatig, from hund (of uncertain origin) + e(a)hta ‘eight’ + -tig (see -ty2).
'eighty' also found in these Oxford entries:

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