This is the 351st most frequent Hebrew word.
בעניין
"Regarding" or "concerning."
The word 'בעניין' is used to introduce the subject of the following clause, which is the test tomorrow.
יש לי שאלה בעניין המבחן מחר.
I have a question regarding the test tomorrow.
Here, 'בעניין' indicates the topic of the discussion held with the manager.
דיברנו עם המנהל בעניין שעות העבודה.
We talked with the manager regarding the working hours.
In this context, 'בעניין' denotes the topic about which the decision was made, namely the changes in company policy.