A

Admittance. The inverse of impedance (A = 1/Z), a measure of how readily a process responds. High admittance to an old rule is the attachment that keeps a process on it. (5.7.1, 8.1.1)

B

Base Layer, General Reality and Self-Reality. The three layers of the mind, each following its own rules. The Base Layer is perception and movement, General Reality handles most things we know and reason about, and Self-Reality contains meaning of emotional significance and attachment. (3.5)
Blindfold. The mind can access only the inside of its boundary, and left to its own devices, it never registers that it’s interpreting. Unaware of the blindfold, you take the inside for the outside. (1.3.2, 10.3)
Boundary. In one sense, light, between the inside and the outside of every natural process. In the other, the edge of a causal space, a line we draw that marks where a rule applies, in effect a level of the process’s impedance to the rule. (4.2.1, 7.3.2)

Causal space. A model we draw around a process so we can say what it does. It has four parts, the cause state before the change, the effect state after it, the rule (Ψ) by which the cause becomes the effect, and the boundary, a line we draw that marks where the rule applies. (7.3)
Causality Axis. An axis of our own, orthogonal to space and time, that stands in for a direction we never observe. It measures how much Incoherence (Δ) a process has accumulated. (5.3)
Cross-impedance. A measure of how much resistance there is when an effect in one causal space induces a response in another, written Z₁₂. It depends on how well the rules of the two spaces fit each other, and it is usually asymmetric, so Z₁₂ ≠ Z₂₁. (8.1.3)

Emergence. What vertical selection leads to, as a process undergoes an Incoherent change and comes out with a different relationship to its rules. Emergence happens along the Causality Axis as Incoherence accumulates, at right angles to the plane. (5.3, 5.7)
Engineered happening. Natural processes arranged by people to produce a particular happening, from an abacus to an AI chatbot. The parts have insides, and the arrangement as a whole has none. (4.2.1, 5.5)

General Selection. One loop for any natural process, living or not, that takes it through four steps, interaction, variability, selection and accumulation. Horizontal selection, along the plane of a rule, is evolution, and vertical selection works on the changes that leave the plane and leads to emergence. (5.2, 5.3)

Harmonization. The effect of vertical selection, as adaptation is the effect of horizontal selection. Of all the Incoherent changes a process goes through, selection keeps the few that work with their surroundings and lets the rest go. (5.3.1, 8.5)

Impedance. Causal impedance, written Z_Ψ or Z = C/E, is our measure of how much a process resists its rule. Higher impedance means the process gives a smaller effect for the same cause. (4.3.2, 8.1.1)
Incoherence. A change in a process’s relationship to the rule that governs it, written Δ. The yellow triangle marks a paradox, and the same mark stands for Incoherence, where a paradox that won’t resolve eventually leads. (2.2, 4.3.3, 5.3.1)
Induction and induced cause. How events in the world give rise to interpretation, and how interpretation produces new events, between two people or any two natural processes, with nothing handed across. At the boundary a cause outside induces a cause inside, and the induced cause is the effect of the cause outside. (1.3.7, 4.2.4, 8.2)

Light. One thing, which we describe in physics as electromagnetism, of which visible light is one form. The same light is also the boundary between meaning and happening, between your inside and the outside, and induction takes place there. (6.2, 6.3)

Meaning and happening. Meaning is every thought, feeling, image, sound, and memory, all the mind produces, and for a cell or an electron, its own way of responding to whatever happens at its boundary of light. Happening is whatever exists outside and continues whether you describe it or not. (1.3.1, 4.2.2)

Natural process. What we usually call a thing, seen as the process it is, since a thing is a snapshot of a process. Every natural process, from an electron or an atom to a cell or a person, has an inside, an outside and a boundary, and its inside responds in its own way. (4.2, 4.2.2)
Natural Reality. A model of reality in which every natural process has an inside and an outside, with a boundary between them. The inside is where individual meaning is made, and the outside is the shared world of happening. (Introduction)
Natural Space. The where of an interaction, a space in which interactions follow distinct causal rules. Like the cup and the body, every Natural Space comes in two, a happening one out there and a meaning one that is our version. (4.3, 4.3.4)

Orthogonality and parallelism. Orthogonality is how meaning and happening relate, at right angles like the two lines of a plus sign, joined at one point, with no part of either pointing along the other. Parallelism is minds standing side by side, each constructing its own internal reality independently, as every process does, with none able to read another’s. (1.3.5, 1.3.4)

Paradox. A gap between what happens and what it means. Inside a mind, it shows up as a mismatch between what you expect and how you interpret what happened, and one of the two has to give. (2.1, 7.4)
Participation. The degree to which a process takes part in an interaction, how much the process is engaged in it. In everyday terms, participation is how much of yourself went into something, a conversation or a book. (9.2)
Phase alignment. A comparison of two processes that go round together, one cycle for each cycle of the other, or many for each. With no lag the two coincide, and as the phase lag (φ) widens, each helps the other less. (8.1.4)
Potential and flow. The meaning inside a process is potential, and the happening it produces outside is flow. Potential induces flow, and flow builds potential again. (4.2.5)

Reaction and response. A reaction is what something happening in the Blue Space induces your mind to construct at your boundary, the raw material for your response. Often, though not always, the response induces action in the Blue Space, and if you catch the reaction, you can pause and choose. (3.2)
Readiness. The state a process responds from. One process changes, and another answers from its own readiness, the way a tuning fork rings from what it was ready to do. (7.2.2)
Red Space and Blue Space. A Red Space is the inside of a natural process, where its meaning is made, and for a person it is the mind. The Blue Space is the shared world of happening, processes interacting and affecting each other, and each process responds to it at its boundary. (1.3.1, 1.3.3)
Resonance. What comes about when interacting processes fall into step, their cycles lined up closely enough that each answer adds to the one before. (8.3)
Rule of Causation. Our name for the regular way a process behaves, written Ψ. Wherever entities interact, the rule governs how, taking a cause (c) and making an effect (e) out of it. (4.1.1, 4.3.1, 7.3.1)