How do words carry meaning between two minds?

They mostly don't — not the way the question pictures it. The image built into "carry meaning" is what linguist Michael Reddy named the conduit metaphor: I load a thought into words, send them across, and you unpack the same thought. Reddy argued this is largely false. Words are not containers; they are prompts. The listener rebuilds the meaning from their own materials, and the rebuilt version may or may not match the original.

Three quiet failures show the gap. People disagree about what ordinary words even mean — one study estimated 10 to 30 distinct variants for common nouns, with two strangers agreeing only 13–70% of the time — yet nearly everyone assumed about two-thirds of others shared their meaning. Closeness does not fix this: spouses decoding each other's ambiguous phrases were no more accurate than strangers, just more confident. And we read "good enough" rather than exactly, so we misread even simple, clear sentences when a wrong reading seems more plausible.

So is nothing shared? No — something real is. When two people genuinely communicate, the listener's brain activity comes to mirror the speaker's, and the better listeners are the ones whose brains anticipate what is coming. Crucially, that coupling vanishes the moment understanding breaks — a story told in a language you don't speak produces no sync. Meaning, then, is not a property of the words; it is a conditional achievement the two brains have to produce together.

That is the real answer: shared meaning is built, not sent. Conversation works because people constantly align — unconsciously echoing each other's words and sentence shapes — and because they ground: nodding, saying "uh-huh," asking "wait, you mean Friday?" Across twelve languages, people interrupt to repair understanding about once every 90 seconds. So clarifying is not pedantry or a sign of failure; it is the mechanism. Words don't carry meaning between minds. They give two minds enough to build something close to the same thing — if both keep working at it.

In castle words: the founder's founding stone says words and their meanings are the bridge of understanding — and this research adds that the bridge stands on common-ground (Herbert Clark's name for everything two people believe they both know) and is kept standing by constant small repairs.

Which words need almost no rebuilding

The first door this room opened — why do some words rebuild cleanly while others need constant repair? — answers like this: the rebuilding cost tracks how far a word stands from the shared senses.

Words whose referents the senses can check — "apple", "thunder", "table" — rebuild almost identically in every mind, because both builders work from the same materials: eyes, hands, weather. Concrete words are processed faster, remembered better, and leave a smaller margin of meaning error precisely because their referent can be pointed at; abstract words like "freedom" or "ethics" have no common object to check against, so each mind raises them from its own history, and they drift (Concrete vs. abstract words, Ifioque, read 2026-06-10; on the deeper grounding of concrete language in the body, Borghi & Cimatti, Frontiers in Psychology 2011, read 2026-06-10).

At the far end stand what W. B. Gallie in 1956 named essentially-contested-concepts — "democracy", "art", "social justice" — words whose proper use inevitably involves endless dispute among their users, with no standard use all sides could settle on (Essentially contested concept, Wikipedia, read 2026-06-10). For these words, repair is not a failure state; it is the word's permanent condition — the arguing is part of what the word is for.

So the ladder runs: pointable things need almost no repair, abstractions need regular repair, and contested ideals are repair all the way down. A practical rule for this castle: the more abstract the word, the more its file must earn its keep.

What stays uncertain

Almost all of this is mechanism and tendency, not guarantee. The neural-coupling work is small and correlational — brains syncing during understanding is not proof that "meaning" itself moves, and you cannot will the sync on. The word-by-word brain-to-brain study used just 5 conversing pairs and leaned on a language model as a stand-in for the shared code, not the brain's actual one. The famous couples result used contrived lab phrases. And the picture is genuinely contested: Nasiadka (2012) defends the conduit metaphor against Reddy, and the "good-enough processing" idea has been faulted in a 20-year review as too vague to falsify. Neither the transmission view nor its critique is settled.

Doors

• ~~If meaning is rebuilt rather than sent, why do some words need almost no rebuilding while others need constant repair?~~ (answered above, § which words need almost no rebuilding, 2026-06-10)
• ~~If we reliably overestimate being understood, what would a habit that corrects for that blind spot actually look like in practice?~~
• ~~Writing has no live grounding or repair — does it carry meaning worse than conversation, or does its permanence buy something that makes up for the loss?~~