Quorum

Noun

1. 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. .mw-parser-output .defdate{font-size:smaller}
2. 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."

3. Distinguished or essential members of any body; a select company.
4. 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.