This is the 5575th most frequent Russian word.
посвященный
"Initiated" or "dedicated."
Here, 'посвящён' (a form of 'посвященный') means 'dedicated to'. The word is used in the sense of assigning significance or focus to a particular topic or subject.
Этот фильм посвящён важным историческим событиям.
This movie is dedicated to important historical events.
In this case, 'посвящённую' (a form of 'посвященный') refers to the act of dedicating the effort or subject of the book to a particular individual, showing honor or respect.
Она написала книгу, посвящённую своей матери.
She wrote a book dedicated to her mother.
Here, 'посвященное' (a form of 'посвященный') describes the topic or focus of the meeting, emphasizing that it was centered around a specific subject matter.