Correct spelling, explanation: this form is correct because there is an ending rd, which also occurs in the word-form third (in this case fifty-third). Therefore ordinal form for 53 is 53rd. Ending th is typical for ordinal numbers ending with this sound, therefore
53th is incorrect and 53rd is the correct form.
Definition of 53rd:
numeral, the ordinal number between 52nd and 54th
We bought my dad a motorbike for his 53rd birthday.
It’s the 53rd day since I’ve stopped smoking and I’m feeling great!
Incorrect spelling, explanation: this is an incorrect form because th is not the right ending for the ordinal number third. For the third and every other number ending with third the ending is rd, so here 53rd is the correct form.
53th is incorrect as it is using the wrong ending. The only correct form is 53rd.
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