Tones: How Pitch Changes a Word's Meaning

Think of singing "do-re-mi" at karaoke. In some languages, every syllable carries its own musical note of pitch when you speak. In Korean, you can say "sagwa" (apple) high or low, and it still means the fruit you eat. In a tonal language, a change in pitch changes the word itself.

The most famous example is Mandarin Chinese. The syllable "ma" has four different meanings, depending on how you pitch it. Say it high and flat, "maaa—", and it means mother (媽). Swoop it up from low to high, like asking "maa?", and it means hemp (麻, the plant used to make rope and cloth).

Dip it low and curve back up, and it means horse (馬). Drop it sharply from high to low, with force, and it means to scold (罵). With the same sound, you can turn your mother into a horse, or into an insult, in a split second.

Tones may seem like something only foreign languages have. But the Korean spoken in the early Joseon era, when Hunminjeongeum (the original Hangul writing system) was created, actually had tones. In old documents, you can see one or two dots to the left of a character. These are called bangjeom (傍點, "side dots"). The number of dots showed the pitch of the syllable.

Over time, standard Korean, including the Seoul dialect, lost these pitch distinctions. They were replaced by differences in vowel length (long and short sounds). For example, "nun" (snow) is pronounced long, while "nun" (eye) is pronounced short.

But traces of the old tones are still clear in the Gyeongsang and Hamgyeong dialects. Take the Gyeongsang phrase "Gaga gaga?" (roughly, "Is that person that person?"). The pitch changes from syllable to syllable, and that is a living trace of tones in Korean.

Many people mix up tone with intonation, the rising or falling pitch at the end of a sentence. Intonation shows the mood of a whole sentence, the speaker's feelings, or whether it's a question or an exclamation. In Korean, for example, raising your voice at the end of "Bap meogeosseo?" (Did you eat?) turns it into a question. But the meaning of the word "bap" (rice, a meal) itself doesn't change.

Tone, on the other hand, belongs not to the whole sentence but to the pitch of each individual word. Every person's voice sits at a different height, but each syllable has a set relative pitch shape, and that shape can shift depending on the syllables before and after it. If you get the shape wrong, listeners may hear a different word or get confused.

To be more precise, estimates of how many languages use tone vary by method, from about 40% of the world's languages to more than half. Tonal systems are found not only in Asian languages like Chinese and Vietnamese, but also in many indigenous languages across Africa and the Americas.