Incorrect spelling, explaination:
12nd is incorrect, because the full word twelfth is spelled with suffix th at the end, not nd. Suffix nd is added to these ordinal numbers that end with it when pronounced, thus to numbers including second (for example fifty-second; 52nd).
Correct spelling, explaination: this numeral form of word twelfth is correct, because suffix th is connected to pronunciation. There is no nd suffix at the end of the full-written word. Therefore 12th is correct and
12nd is wrong.
Definition of 12th:
numeral, ordinal number between 11th and 13th
I’m so sick of moving places – this is 12th flat I’m renting in my life!
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