fiftieth
🇺🇸
/ˈfɪftiəθ/
🇬🇧
/ˈfɪftiəθ/
One part when something is divided into 50 equal parts.
He saved a piece of cake for his fiftieth share of the dessert.
The number that comes after 49th and before 51st.
Her fiftieth birthday was a grand celebration.