This is the 6th most frequent Armenian word.
մասին
"About" or "regarding."
The word "մասին" is used here to mean "about," introducing the topic being discussed.
Ես կարդացի մի հետաքրքիր հոդված մասին նոր տեխնոլոգիաների.
I read an interesting article about new technologies.
Here, "մասին" refers to "about," indicating the content of the discussion.
Նա խոսեց ֆիլմի մասին ամբողջ երեկո.
She talked about the movie the entire evening.
In this sentence, "մասին" is employed as "about" to denote the subject being debated.