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"fourteenth" is also used as a crossword clue. If that's what you saw, the answer is often xiv (3 letters).
Definitions
Coming next after the thirteenth in order.
Word origin
Inherited from Middle English fourtenthe, fourtethe, from Old English fēowertēoþa, equivalent to fourteen + -th.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“After 13th”10 letters
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