olemus
Wiktionary:
1. a period devoted to a particular activity, e.g. the annual or semiannual periods of a legislative body (that together comprise the legislative term) whose individual meetings are also called sessions
2. a meeting of a council, court, school, or legislative body to conduct its business
This court is now in session.

ülevaateid
https://en.wikipedia.org/wiki/Meeting_(parliamentary_procedure)#Session

https://en.wikipedia.org/wiki/Court_of_Session

https://en.wikipedia.org/wiki/Legislative_session