Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
the most important member of a group or part of a system, that holds together the other members or parts or makes it possible for them to operate as intended:
a person or thing that is the most important part of a group or system’s operation:
Share your knowledge with the community
Browse our collection of 300,000+ community-written definitions
