Meaning of “twelfth” in the English Dictionary

"twelfth" in American English

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twelfthadjective, adverb, noun [ C ]

us /twelfθ/

(a person or thing) coming immediately after the eleventh and before all others:

She finished twelfth in her age group.
[ C ] We will arrive on the twelfth of December.

A twelfth is one of twelve equal parts of something.

(Definition of “twelfth” from the Cambridge Academic Content Dictionary © Cambridge University Press)