noun
fiftieth day after a child's birth
Traditional Japanese milestone; families often celebrate the baby's health and growth on this day.
赤ちゃんの五十日のお祝いをしました。
We celebrated the baby's fiftieth-day milestone.
noun
fifty days
Literal count of fifty days; less common than the milestone sense.
契約から五十日以内に支払ってください。
Please pay within fifty days of the contract.