in; at (place); regarding~; as for~
Indicates the location, time, or context in which something takes place, often in formal or written Japanese.
において is a formal equivalent of で for place, or に for time, but it also extends to abstract contexts like 'in the field of' or 'regarding'. You'll hear it in speeches, news, and academic writing, less so in everyday chat. When used for place, it often sounds more official than で, like 'at the ceremony' or 'in the conference'.