noun
company newsletter; in-house bulletin
A publication distributed within a company to share internal news, announcements, and employee information.
今月の社内報に新入社員の紹介が載っている。
This month's company newsletter features introductions of new employees.
社内報で社長の年頭挨拶を読んだ。
I read the president's New Year's greeting in the in-house bulletin.
Compound of 社内 (in-company) and 報 (report, news). The exact historical derivation is uncertain, but the word is a straightforward modern formation.