Incorrect spelling, explaination: this is an incorrect form of this numeral, because twenty-third is pronounced with suffix -rd at the end. This point to correct form 23rd, as third is a part of this ordinal number.
Correct spelling, explaination: 23rd is an ordinal number, pronounced twenty-third. This pronunciation point to suffix -rd. -th is the suffix added to numbers ending with this sound when pronounced. Therefore the form
23th is incorrect.
Definition of 23rd:
numeral, ordinal number between 22nd and 24th
Jason came 23rd in this half-marathon – not bad at all!
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