session

noun

An informal gathering of musicians to play music, especially improvised jazz or a similar genre.

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.

   "Are we having a recording session?" / "Yes. We've even got some session musicians to provide some brass."

2. A meeting of a council, court, school, or legislative body to conduct its business.

   This court is now in session.

3. The sequence of interactions between client and server, or between user and system; the period during which a user is logged in or connected.

   Logging out or shutting down the computer will end your session.

4. Any of the three scheduled two hour playing sessions, from the start of play to lunch, from lunch to tea and from tea to the close of play.
5. The act of sitting, or the state of being seated.
6. An academic term.

verb

To hold or participate in a jam session with other musicians.