Reference · The Chart
Definition in Human Design
After type, the Human Design System reads a chart's definition: not which centers are switched on, but how those centers are wired together. This page sets out what definition means, the categories the system sorts charts into — Single, Split, Triple-Split, Quadruple, and the No Definition of Reflectors — and what it claims each one says about how a person processes and connects. It reports the system's model; it does not judge whether the model is true.
What "definition" means
In the system's terms, a center is defined when a complete channel connects it to another center — a channel being a wire between two centers that is only switched on when both of its gates are activated. Definition is the next question the system asks: once you know which centers are lit, how many separate connected groups do the channels form? A chart whose defined centers all link into one unbroken circuit is read very differently from one whose defined centers sit in two or three islands with no wire between them. That count of separate groups is what the system calls a person's type of definition.
The system frames definition as the description of how a person's energy is internally joined up — which parts of them run together consistently, and which are held apart until something outside, a moment or another person, bridges the gap. It is read from the same BodyGraph wiring that produces type, and follows directly from which channels are complete.
“Definition is not which centers are switched on — it is how many separate circuits the channels wire them into.”
The kinds of definition
The system names its categories by how many separate groups the defined centers form, from one unbroken circuit down to none at all. Each is given a claim about how such a person is said to process information and connect with others.
| Definition | Circuits | What the system claims it says |
|---|---|---|
| Single Definition | One group | All defined centers hang together in a single connected circuit. The system frames this as self-contained processing — a person it describes as running on their own consistent inner wiring, not reliant on others to complete a thought. |
| Split Definition | Two groups | The defined centers fall into two separate circuits with no channel bridging them. The system says such a person looks — often unconsciously — for the gate or person that links the two halves, and describes them as drawn to what completes the gap. This is noted as the most common arrangement. |
| Triple-Split Definition | Three groups | Three separate circuits of defined centers. The system frames this as busier, more independent processing that it says benefits from variety, movement, and time — a person less quickly settled than a single or split. |
| Quadruple (Quad) Split | Four groups | Four separate circuits — the most fragmented definition, and the rarest. The system frames it as needing consistency and routine to bring the parts into working order. |
| No Definition | No connected centers | No center is wired to another by a full channel; every center is open. This is the chart of the Reflector, the rarest type, which the system describes as sampling and mirroring the environment rather than running on a fixed inner circuit. |
The processing-and-connection claims are the system's own characterizations, described here as part of its model rather than as claims this archive evaluates. Split definition is commonly cited within the system as the most frequent of the arrangements.
How definition sits with the rest of the chart
Definition is one thread in a larger reading. It depends entirely on which channels are complete, which in turn depends on which centers are defined — and the pattern of defined and open centers is also what fixes a person's type. A Reflector, the type with no defined centers, is by definition the No-Definition chart. The system reads all of these together rather than in isolation. It is worth noting that the type-and-strategy layer these mechanics are usually introduced alongside was a 1997 addition to a system Ra Uru Hu had been teaching in the United States since 1993 — a history documented from the primary record in the archive's two books.
Sources: definition and its categories — Single, Split, Triple-Split, Quadruple, and No Definition — are set out in the system's own literature, published by Jovian Archive and the IHDS; the wiring they describe is documented in the centers and the channels references, and the types they align with in the types reference. The founding and teaching history is documented from the primary record in ZENO and The Voice on Ibiza.
Each kind in full
A page each, covering how the arrangement is read from a chart, what the system claims it means, and where the category sits among the other layers.