This is the 1328th most frequent Russian word.
третьей
The Russian word "третьей" means "third" in the feminine singular instrumental or genitive case.
Indicates ordinal position in a sequence: third week.
Её день рождения приходится на третьей неделе июня.
Her birthday falls on the third week of June.
Specifies location in a sequential context: third page.
Он встретил её на третьей странице книги.
He met her on the third page of the book.
Indicates ranking or position in order: third in line.