Originally written in French. Translated by AI — the meaning has been preserved, not the prose.
Short definition
A self-standing, conceptual and reusable note, carrying a single intellectual centre of gravity — that is, one whose entire content serves the same idea.
Full definition
The word comes from personal knowledge-management methods, where it designates the basic unit of a network of linked notes. Ordinary usage brings it close to "short", by analogy with the atom: a minimal unit, therefore the briefest note possible.
In the articles on this blog, the word keeps the first acceptation and sets aside the second. Atomicity designates a cohesion, not a size: a three-line note mixing two hunches isn't atomic, a one-page note that chains definition, explanation, example and nuance in the service of a single idea is. The conceptual centre of gravity is the name of that single idea everything in the content relates to.
Three properties accompany the term in this usage: the statement is reformulated, therefore detached from the author and the text that brought it out; the title is a proposition, therefore contestable; the note is linked to others by named relations.
Usage in the field
Used to designate the unit of a knowledge base, and to separate it from what precedes it (capture) as much as from what aggregates it (the thematic note). It comes into play in reasoning about how a corpus is divided up, about how a base grows denser as sources arrive, and about the passage from reading to writing.
Synonyms and variants
"concept note", "zettel" in the Zettelkasten tradition, "unit of thought". "Atomicity" designates the property rather than the object.
Not to be confused with
- Capture — the gesture by which a source or a fragment is kept at the moment you meet it, with no decision about what it will become. Capture stays attached to its original context; the note begins at reformulation.
- Flash card — a short formulation you want to hold in mind, selected on personal resonance. The card anchors a pillar, the note organizes an idea: the two are separated by the threshold of entry, not by size.
- book summary — a report on a work, organized by the order of the source. It files knowledge by origin; the atomic note files it by concept.
- thematic note — a light synthesis assembling several notes around an angle. It organizes building blocks; the atomic note stabilizes one.
Examples
Atomicity is a label, not the title of an atomic note. Atomicity serves reuse more than concision is one: it asserts, therefore it can be linked and contested.
Ambiguities / debates
The main ambiguity bears on size, and it is sustained by the word itself: "atomic" suggests a miniaturization the definition doesn't require. A second ambiguity bears on timing — the term describes a state obtained after clarification, whereas it is often read as a requirement to satisfy from the moment of capture.