Usage Note
Cinquantesimo is the ordinal number for 50th. Like all Italian ordinals, it agrees in gender and number with the noun it modifies: il cinquantesimo anniversario (the fiftieth anniversary), la cinquantesima pagina (the fiftieth page). It can also be used as a noun (il/la cinquantesima) to mean 'the fiftieth one'.
Examples
"Oggi celebriamo il cinquantesimo anniversario della fondazione."
Natural Translation
Today we celebrate the fiftieth anniversary of the founding.

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