This is the 2071st most frequent Arabic word.
باعتباره
"As considered" or "in his/its capacity as."
The word "باعتباره" is used here to introduce the role or identity of Ahmed as seen by the speakers.
نرحب بأحمد باعتباره ضيفًا مميزًا في الحفل.
We welcome Ahmed as a distinguished guest at the event.
In this sentence, "باعتباره" explains the reason for the book's high regard by providing its qualities.
يُعتبر هذا الكتاب من الأفضل في مجاله باعتباره يحتوي على معلومات دقيقة وموثوقة.
This book is considered one of the best in its field as it contains accurate and reliable information.
Here, "باعتباري" indicates the reason or justification for the speaker's selection as defined by their role or position.