What definition is
Definition shows how the defined centers in a chart are connected. When a channel is activated at both ends, it "switches on" two centers and a steady energy flows between them. Channels can chain several centers into one system, or they can form separate groups with no link between them. What's defined is your constant, reliable side, while the open centers around it take in other people's influence.
Kinds of definition
The number of separate groups gives the kind of definition: single (one group), split (two), triple split (three), quadruple split (four), and no definition in the Reflector. It shows how a person processes information — on their own and quickly, or over time, through other people and different settings — and where the strongest conditioning comes from: the open centers or the bridging gates. Definition doesn't replace strategy and authority, but it helps you understand the pace of your decisions.