First Lesson
Plato's dialogue on whether names have an inherent link to the things they represent
Around 385 BCE, Plato wrote a dialogue called the Cratylus. It is one of the oldest surviving arguments about a question that still haunts language theory: Do words connect to things because of some natural bond, or only because people agreed to use them that way? The dialogue features two characters on opposite sides. Cratylus argues that names have a natural correctness — that the sounds and shapes of words somehow fit the things they describe. Hermogenes argues the opposite — that names are purely conventional, a matter of custom and habit. Socrates, as usual, plays referee, poking holes in both positions. The debate never fully resolves, and that is part of the point. Plato wanted us to sit with the tension.
Think of it this way. When you hear the English word "crash," it sounds a bit like the thing it describes — a sudden, loud impact. That might make you lean toward Cratylus. The sound seems to carry meaning on its own. Words like "buzz," "hiss," and "splash" work this way too. They are examples of onomatopoeia, words that imitate the sounds they refer to. But now consider the word "dog." There is nothing dog-like about those three letters or their sounds. In French, the word is "chien." In Japanese, "inu." If names were natural, why would different languages use entirely different sounds for the same animal? This is the strongest card in Hermogenes' hand. The sheer diversity of human languages suggests that most words are arbitrary — they mean what they mean because a community treats them that way, not because nature demands it.
A linguistic sign is not a link between a thing and a name, but between a concept and a sound pattern.— Ferdinand de Saussure, Course in General Linguistics
More than two thousand years after Plato, the Swiss linguist Ferdinand de Saussure gave Hermogenes' position its modern form. In his lectures at the University of Geneva (published after his death in 1916), Saussure introduced a key idea: the arbitrariness of the sign. A sign, for Saussure, is made of two parts — a concept in your mind (he called it the "signified") and a sound pattern you use to express it (the "signifier"). His central claim was that the link between these two parts is arbitrary. There is no law of nature that forces the concept of a tree to be paired with the English sounds t-r-ee. Any sound would do, as long as speakers agree on it. This principle became a cornerstone of modern semiotics — the study of signs and meaning. It means that language is, at bottom, a social contract. Words work because we trust each other to keep using them the same way.
But Cratylus was not completely wrong, and the natural side of the argument keeps resurfacing. Research in sound symbolism has shown that certain sound-meaning links appear across unrelated languages. In a famous experiment, the psychologist Wolfgang Köhler showed people two shapes — one spiky, one blobby — and asked which was called "kiki" and which "bouba." Overwhelmingly, people matched "kiki" to the spiky shape and "bouba" to the round one, regardless of their native language. This suggests that our brains do sometimes feel a natural fit between certain sounds and certain meanings. It does not overthrow Saussure's principle — the vast majority of words remain arbitrary — but it adds a wrinkle. Language is mostly conventional, yet not entirely deaf to the textures of the world it describes. The old tension between Cratylus and Hermogenes lives on, not as a settled debate, but as a productive one.
Plato, Cratylus, trans. C.D.C. Reeve, in Plato: Complete Works, ed. John M. Cooper (Hackett, 1997). — The foundational text for this debate. Reeve's translation is clear and well-annotated, making it accessible for first-time readers of Plato.
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