Noun
A dining room, especially one on an upper floor (traditionally the room in which the Last Supper took place). [from early 15th c.]
(by extension) A small circle or gathering of specialists (writers etc).
Synonyms: circle, clique
At the end of the day, the will also celebrate mass at the site known as the Cenacle, or Upper Room, bringing into sharp focus a decades-long debate over prayer rites at the site where Christians believe Jesus had his Last Supper. Source: Internet
He claimed almost total independence from the Jerusalem community, : pp.316–320 (possibly in the Cenacle ), but agreed with it on the nature and content of the gospel. Source: Internet