Translation:You are not the eighty-third, but the eighty-second.
"Második" is only used with the number 2 (two).
Similarly, "első" (first) is only used with the number 1 (one). Any other number ending with '1' will be "...egyedik".
Is definite article always required with the ordinals? I don't think I have seen an example without it in this lesson.