The difficulty with the vocabulary of the present moment is not that it is obscure. It is that it is spoken with complete fluency by large numbers of people who have never been obliged to say what any of it means.
A few of the words are new. Most are old words pressed into new service, or new coinages that sound more precise than they are. The ones that repay attention are the ones that do argumentative work while appearing only to describe. I want to set down a handful of them as they are actually used, not as the glossaries claim they are used.
Take hallucination. The field prefers the word because it suggests a temporary fever — a departure from some baseline of truthful operation to which the system would otherwise return. The less comforting description is that the model is performing the identical act when it produces a true statement and when it produces a false one: generating the most plausible continuation of the text before it. Truth is not the objective. Plausibility is. The word hallucination frames the failure as a malfunction. It is closer to the truth to call it the mechanism, observed on an occasion when the plausible and the accurate happened to diverge. Once one has seen this, it becomes harder to treat the word as a neutral diagnosis.
Alignment is asked to carry still more. In its narrow technical sense it names a real research programme. In public speech it has become the place where the entire ethical content of the field is asked to reside, so that a single noun is expected to mean safe, honest, obedient, harmless, and agreeable to the speaker’s politics, all at once and without contradiction. These are not the same goal. The term also quietly assumes the existence of a fixed thing to be aligned to. The field has not produced one.
Agentic is an adjective doing the work of a promise. An agentic system is one that has been granted the standing to act rather than merely to describe — to take a goal, break it into steps, call tools, and continue without further instruction at each turn. The interesting question is never the grammar but the leash: what the system has been permitted to touch, and what happens when a long effort concludes with a confident wrong answer delivered in the register of a junior colleague reporting success. The older word autonomous had begun to alarm people. Agentic alarms them less. That is, on examination, its principal qualification for the post.
Context window is more honest than most of the vocabulary. It names the finite quantity of text the model can attend to at one time. Users who form the natural impression that the system remembers a long exchange have mistaken the window for a mind. What falls off the far edge is not forgotten; it was never retained. The windows have grown large enough that the limit is easy to forget. It has not ceased to exist, and it does its most damage to the people most certain it is no longer there.
Prompt is a modest word that has been asked to support a surprising amount of apparatus. For a period there was talk of prompt engineering as though it were a discipline. Some of this was real; much of it was the ordinary human tendency to dignify a knack with a title. What the verb quietly imports is a flattering picture of the exchange: one prompts a person to mean one is giving a small nudge to a mind that will do the rest. Applied to a machine, the same verb suggests a nudge and a mind. In the plain case it is an instruction given to a mechanism, and the whole performance is downstream of how the instruction was phrased.
Slop is the rare gift in the list: a word coined by the public, against the industry, and fit for its purpose. It names machine-generated content produced in bulk, of low quality, and distributed without regard to whether anyone wished to receive it. The force of the word lies in its honesty about volume and motive both. It is the term the language reached for when it needed to describe the smell of the new abundance.
Reasoning remains the most contested. That the technique of generating intermediate steps improves performance on problems that have steps is not in dispute. What is in dispute is whether those steps are reasoning or merely a sequence of generated text that improves the answer by a mechanism that need not resemble reasoning at all. Anyone who uses the word as though its meaning were settled has already joined one of the two parties without announcing it.
A few other terms repay the same scrutiny. Guardrail concedes, in the metaphor itself, that the underlying system is not reliable and that reliability has been relocated to a passive barrier at the edge of the road. Human-in-the-loop means two opposite things depending on who says it: a genuine safeguard with time and authority to refuse, or an alibi whose function is to be available afterward as the party who approved the error. Moat names the durable advantage every laboratory is searching for and few appear to possess. Open-weight is carefully distinguished from open-source by those who release the weights: one is handed the finished artefact, not the recipe.
The useful work of a lexicon in a moment like this is not to arrest the language. That cannot be done. It is only to leave a clear record of what a few of the central words were being asked to mean at one particular hour, so that a later reader, encountering them shifted, has something against which to measure the shift. The vocabulary will continue to be minted faster than it can be set down. The euphemisms will continue to be preferred to the plain words they replace. The public will continue to speak the whole of it fluently and define almost none of it. That was already true when these notes were written, and it remains the ordinary condition of a vocabulary that has outrun its own settlement.