sixty

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Concise Oxford English Dictionary © 2008 Oxford University Press:
sixty/ˈsɪksti/
cardinal number (pl. sixties) the number equivalent to the product of six and ten; ten more than fifty; 60. (Roman numeral: lx or LX)
– derivatives
sixtieth ordinal number,
sixtyfold adjective & adverb.
– origin OE siextig (see six, -ty2).
'sixty' also found in these Oxford entries:

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