Sentence:  With Mary in the <WSD>cenacle</WSD> waiting for the Holy Spirit In the Acts of the Apostles after  listing the names of the eleven apostles, Luke continued with these words, so precious to Christians: ... 
Meaning of the word marked with <WSD> tags:  A dining room, especially one on an upper floor (traditionally the room in which the Last Supper took place). (from early 15th c.)