noun
special issue devoted to a single topic
Used for magazine or periodical issues that focus entirely on one theme, often with the nuance of putting all effort into covering that topic.
今月の総力特集は「日本の城」です。
This month's special feature is 'Japanese Castles'.
その雑誌は年に一度、環境問題の総力特集を組む。
The magazine puts together a special issue on environmental issues once a year.
特集 is a general special feature or section, while 総力特集 implies a more comprehensive, all-out effort on a single topic.
Compound of 総力 (all-out effort) and 特集 (special feature).