# EmergenceLexicon > A concept graph in which every word's meaning is an emergence explanation — > components, interaction, novel properties — that provably chains down to four > foundations. Levels are computed from the graph, never asserted. Definitions > are closure-checked: every content word resolves to a lower node. 1211 concepts · deepest chain L23 · 176 window-ontology entries · 91 folk phrases ## The four foundations - [energy](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-energy.capacity) — That by which things can be not as they were. - [pattern](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-pattern.regularity) — That which is the same again: what is here is also there, or what is now was also before. - [space](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-space.extent) — Where things can be: that in which one thing is here and another is there, apart. - [time](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-time.dimension) — The before and after of things: that in which a thing can be, and then not be the same. ## URL conventions Every concept has a canonical URL of the form `https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-` where `` is `term.sense` — senses are keyed separately, so `operation.math` and `operation.surgery` are different concepts. Machine-readable formats for every concept: - `…/what-is-the-meaning-of-` — HTML - `…/what-is-the-meaning-of-.json` — structured record (definition, emergence components, examples, computed level, provenance) - `…/what-is-the-meaning-of-.md` — plain markdown, no navigation - `…/context/.json` — resolved context for conversational agents: components and dependents as terms rather than ids, plus the full chain to the foundations, so an assistant can answer without walking the graph. Index of ids: `…/context/index.json` ## What makes this different from a dictionary Each entry states what the concept *emerges from* (its components), *through what interaction*, and *what is novel* about it — properties present in no component alone. Following components downward always terminates at space, time, energy or pattern. ## Index - Full sitemap: https://emergencemachine.com/tools/lexicon/sitemap.xml