birthday به انگلیسی
From Longman Dictionary
birth‧day /ˈbɜːθdeɪ $ ˈbɜːr-/ ●●● S1 W3 noun [countable]
your birthday is a day that is an exact number of years after the day you were born
روز تولد شما روزی است که تعداد دقیق آن چند سال پس از روز تولد شماست
a day that is an exact number of years since an organization was established or an event first happened
روزی که عدد دقیقی از سالهایی است که یک سازمان تأسیس شده یا یک رویداد برای اولین بار اتفاق افتاده است
Example
It’s my 18th birthday next week
Here the bridge between us is the Society of St Peter Apostle, whose hundredth birthday we celebrate this year
Or rather, they photograph you only on formal occasions: birthdays, weddings, Christmas
It is five years since the settlement was established, and they are celebrating the birthday
In this case she went back to her third birthday