fifty

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Concise Oxford English Dictionary © 2008 Oxford University Press:
fifty/ˈfɪfti/
cardinal number (pl. fifties) the number equivalent to the product of five and ten; half of one hundred; 50. (Roman numeral: l or L)
– derivatives
fiftieth ordinal number,
fiftyfold adjective & adverb.
– origin OE fīftig (see five, -ty2).
'fifty' also found in these Oxford entries:

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