15:03 Feb 26, 2010 

'Plenary session is a term often used in conferences to define the part of the conference when all members of all parties are to attend. These sessions may contain a broad range of content from keynotes to panel discussions and are not necessarily related to a specific style of delivery. The term has been used in the teaching profession to describe when information is summarized. This often encourages class participation.' (wikipedia)

14:59 Feb 26, 2010 

'plenary: describes a meeting at which all the members of a group or organization are present, especially at a conference,
a plenary session of the UN Security Council'
(Cambridge Advanced Learner's Dictionary)