2
: being one of 19 equal parts into which something is divisible
a nineteenth share of the money
1
: number 19 in a countable series
the nineteenth of the month
2
: the quotient of a unit divided by 19 : one of 19 equal parts of something
one nineteenth of the total
3
a
: a musical interval (see interval sense 2c) embracing two octaves and a fifth : a musical interval embracing nineteen diatonic degrees
b
: an organ stop producing notes a nineteenth above those of the keys used
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Merriam-Webster unabridged
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