Wiktionary
five-hundredth
a. The ordinal form of the number five hundred. n. 1 The person or thing in the five-hundredth position. 2 One of five hundred equal parts of a whole.
WordNet
five-hundredth
adj. the ordinal number of five hundred in counting order [syn: 500th]
Usage examples of "five-hundredth".
It contained the electrifying news that the celestials had agreed to a future meeting, to be conducted during the five-hundredth revolution of the gas giant.