This is the 2134th most frequent Russian word.
адресу
"Адресу" is the dative case of "адрес," meaning "address" in English.
The word "адресу" is used in the dative case to denote the destination or recipient of the letter.
Я написал письмо по указанному адресу.
I wrote a letter to the provided address.
Here, the word "адрес" is in its nominative form, expressing the concept of a location used in postal communication.
Пожалуйста, сообщите ваш почтовый адрес.
Please provide your mailing address.
In this sentence, "адресу" is in the dative case following "по", denoting the intended location or the recipient's address in context.