- - Meccas
- - Very busy airports
- - Train stations, for example
- - Wheel centres
- - O'Hare and DFW, for two
- - Ethernet devices
- - Busy centers
- - Airports where lots of people change planes
- - Air traffic centers
- - Activity centers
- - Major airports
- - Central airports
- - Centers
- - O'Hare and LAX
- - Bike wheel parts
- - Focal points
- - Nerve centers
- - Busy airports
- - More than one centre gets rare bush
- - Key airports
- - ATL and LAX, for two
- - O'Hare and Dallas/Fort Worth
- - Computer centers
- - LAX, O'Hare and others
- - Car parts that have caps
- - Centers of wheels
- - Major transfer spots
- - Places to make connections
- - Layover cities, often
- - ORD and ATL, e.g.
- - O'Hare and JFK
- - JFK et al.
- - Parts of cars with caps
- - Processing centers
- - Wheel centers
- - Major airports, e.g.
- - City centers
- - Important airports
- - Airline routing centers
- - Primary intersections
- - Central sections
- - Naves
- - Focal areas
- - Central parts
- - Active centers.
- - Central parts of wheels.
- - Chief centers of important activity.
- - Connection points
- - Network connections
- - Cores
- - Where many connections are made
- - Loci
- - Central points
- - Centers of activity
- - Centers of interest
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- [ Other definitions ]