term:

Quorum

quorum n

[Middle English, a select number of English justices of the peace formerly required to be present at sessions to constitute a lawful bench, from Latin, of whom, genitive plural of qui who; from the wording of the commission once issued to justices of the peace in England]
: the number (as a majority) of members or officers that must be present to conduct business [lacked a at the meeting of shareholders]