Incorrect spelling, explaination:
23th is the wrong way of writing the ordinal number twenty-third, because it doesn’t end with the sound -th. When the ordinal number ends with third, the only correct suffix is -rd as in 23rd.
Correct spelling, explaination: this ordinal number, 23rd, is written with suffix -rd, because, when pronounced, it is heard (twenty-third). Another suffix is -th, which is incorrect to use here, because there is no -th at the end of the word when we pronounce it. This is why writing
23th is wrong.
Definition of 23rd:
numeral, ordinal number between 22nd and 24th
This is his 23rd purchase in this online bookshop this year. He must be a real bookworm.
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