Etymology
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sixty (adj., n.)

"1 more than fifty-nine, twice thirty; the number which is one more than fifty-nine; a symbol representing this number;" Old English sixtig, from siex (see six) + -tig (see -ty (1)). Similar formation in Old Norse sextugr, sextögr, sextigir, Old Frisian sextich, Middle Dutch sestig, Dutch zestig, Old High German sehszug, German sechzig. Phrase sixty-four dollar question is attested from 1942, from a radio quiz show where that was the top prize.

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Definitions of sixty
1
sixty (n.)
the cardinal number that is the product of ten and six;
Synonyms: " / lx
2
sixty (adj.)
being ten more than fifty;
Synonyms: " / lx / threescore
From wordnet.princeton.edu