quorum

noun4

1. •
   The minimum number of members required for a group to officially conduct business and to cast votes, often but not necessarily a majority or supermajority.

   • We can discuss the issue tonight but cannot vote until we have a quorum.
2. •
   The minimum number of votes that a distributed transaction has to obtain in order to be allowed to perform an operation in a distributed system.
3. •
   (historical) A select body of (usually eminent) justices of the peace, every member of which had to be present to constitute a deciding body; a member of this body. Later more generally: all justices collectively.
4. •
   (no longer used) Distinguished or essential members of any body; a select company.