noun

1. 1. the sitting together or meeting of a group; assembly, as of a court, legislature, council, etc.
   2. a continuous, day-to-day series of such meetings
   3. the term or period of such a meeting or meetings
2. 1. a school term
   2. a day when school is open for classes
3. the governing body of a Presbyterian church, consisting of the minister and elders
4. a period of activity of any kind a session with the dentist

Etymology: ME < L sessio < sedere, to sit