This is the 5135th most frequent Arabic word.
بإعلان
"بإعلان" means "by announcing" or "through an announcement" in English.
The word "بإعلان" here functions as a noun indicating the act of announcement, with the preposition "ب" meaning "by" or "with."
تمت مفاجأة الجميع بإعلان النتائج المبكرة.
Everyone was surprised by the announcement of early results.
In this case, "بإعلان" introduces an action showing the method of starting, indicating performing "announcement" as the beginning step.
سأبدأ بإعلان الفائز حالاً.
I will start by announcing the winner now.
Here, "بإعلان" is used to express contentment related to making an announcement, where "ب" conveys association with or relation to the announcement.