This is the 17554th most frequent Russian word.
трехстороннем
"Three-sided" or "tripartite."
The word "трёхстороннем" is used to describe a discussion involving three parties, emphasizing the collaborative nature involving three sides.
Мы участвовали в трёхстороннем обсуждении.
We participated in a tripartite discussion.
Here, "трёхстороннем" refers to the format of the document being adapted to include three parties or perspectives.
Документ заключён в трёхстороннем формате.
The document is concluded in a tripartite format.
In this sentence, "трёхстороннем" emphasizes the procedural manner of involving three entities in achieving a resolution.