1
: being number 66 in a countable series
the sixty-sixth day
see Table of Numbers
2
: being one of 66 equal parts into which something is divisible
a sixty-sixth share of the money
"
1
: number 66 in a countable series
2
: the quotient of a unit divided by 66 : one of 66 equal parts of something
one sixty-sixth of the total
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Merriam-Webster unabridged
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