This is the 5135th most frequent Turkish word.
ibaret
Consisting of; composed of.
The word "ibaret" indicates that the subject "life" is only composed of, or consists of, "an experience full of achievements" in this context.
Hayat başarılarla dolu bir deneyimden ibarettir.
Life consists of an experience full of achievements.
Here, "ibaret" conveys that the book, as a whole, is limited to or only includes "the author's opinions."
Kitap yalnızca yazarın görüşlerinden ibarettir.
The book consists solely of the author's opinions.
In this sentence, "ibaret" expresses that the meeting should not solely be "made up of formalities," suggesting additional content or purpose is desired.