triplewise
/ˈtrɪbəlwɪz/Definitions
1. adverb
in a way that involves three things or people, especially in a collaborative or mutually beneficial manner
“The research project was completed triplewise, thanks to the collaboration between the three teams.”
2. noun
a relationship or connection between three people or things
“Their triplewise friendship lasted for decades, despite living in different parts of the world.”