session

noun:a meeting or period of time used for a particular purpose, such as for discussion, activity, or a class
- The therapy session was very productive.
noun:a period of time devoted to a specific activity, especially by a group such as a legislative or judicial body
- The judge announced the start of the trial session at 9 a.m.
noun:a user's interaction period with a computer system after logging in
- Your session will automatically log out after 30 minutes of inactivity.