WordReference Random House Unabridged Dictionary of American English © 2020
sev•en•ty-third  (sevən tē thûrd),USA pronunciation adj. 
  1. next after the seventy-second;
    being the ordinal number for 73.
  2. being one of 73 equal parts.

n. 
  1. a seventy-third part, esp. of one (&fracnumer;
    1&fracdenom;
    73&fracend;
    ).
  2. the seventy-third member of a series.

'seventy-third' also found in these entries (note: many are not synonyms or translations):
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