Etymology
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seventeenth (adj., n.)

"next in order after the sixteenth; an ordinal numeral; being one of seventeen equal parts into which a whole is regarded as divided;" c. 1300, seventenþe, from seventeen + -th (1); replacing forms based on Old English seofonteoþa.

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Definitions of seventeenth
1
seventeenth (n.)
position 17 in a countable series of things;
2
seventeenth (adj.)
coming next after the sixteenth in position;
Synonyms: th
From wordnet.princeton.edu