This is the 9373rd most frequent Russian word.
тедеев
"Тедеев" is a Russian surname and does not have a standalone meaning in English.
In this case, 'Тедеев' is used in the prepositional case, reflecting the use of the pronoun 'о' (about).
Мы говорили о Тедееве вчера.
We talked about Tedeev yesterday.
In this sentence, 'Тедеев' is used as a proper noun, likely referring to a person's last name.
Тедеев выиграл соревнование.
Tedeev won the competition.
Here, 'Тедеев' is used in the possessive case (genitive) to indicate that the book belongs to Tedeev.