n.1. A means of connection; a link or tie:2. A connected series or group.3. The core or center. https://www.thefreedictionary.com/Nexus
nexus - nex·us (nĕk′səs)
n.
1. A means of connection; a link or tie:
2. A connected series or group.
3. The core or center. https://www.thefreedictionary.com/Nexus