In Chinese political coverage,
全会 is shorthand for
中央委员会全体会议 ('full plenary of the Central Committee'). The famous
三中全会 (Third Plenum) is the third such meeting of each Party Congress's Central Committee — historically the venue for major economic-policy turns (most famously the 1978 Third Plenum that launched
改革开放 'Reform and Opening Up'). Measure word:
届 (jiè) for sessions in a numbered series.
