A ~ is the minimum number of people that a committee needs in order to carry out its business officially. When a meeting has a ~, there are at least that number of people present.
...enough deputies to make a ~.
N-SING
QUORUM
Meaning of QUORUM in English
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012