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Twelveth (adjective)
twelfth.
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Twelfth (adjective)
The ordinal form of the number twelve, describing a person or thing in position number 12 of a sequence.
“The answer appears on the twelfth page of the book.”
“She finished twelfth in the race.”
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Twelfth (noun)
One of twelve equal parts of a whole.
“A twelfth of 240 is 20.”
“Five twelfths of the population voted in support of the proposal.”
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Twelfth (noun)
An interval equal to an octave plus a fifth
Wiktionary