A good argument can be completely true and still lose — not because the audience is irrational, but because they're using a different mental dictionary than you are. The Polish-American thinker Alfred Korzybski spent his career documenting this gap: the word is not the thing it names, and two people using the same word often mean subtly different things, building their reasoning on what look like shared foundations but aren't. In a trial or a boardroom, you can win every logical exchange and still watch your case collapse because 'reasonable doubt,' 'negligence,' or 'harm' meant something different inside the listener's head than it did inside yours. The underused discipline Korzybski called 'semantic hygiene' — the habit of explicitly defining the key terms of your argument before deploying them — isn't pedantry. It's the structural work that makes everything else load-bearing.

Pick the single most important word in an argument you're currently building. What does your audience almost certainly mean by it — and is that the same as what you mean?

Drawing from General Semantics — Alfred Korzybski (Science and Sanity, 1933)