What Do Choseong Jungseong Jongseong Mean?
Choseong jungseong jongseong literally mean "first sound, middle sound, last sound". Each word joins a Sino-Korean prefix to 성 (聲, "sound"): 초 (初) is "first", 중 (中) is "middle" and 종 (終) is "end". The 1446 Hunminjeongeum Haerye already analysed every syllable with these three terms.
| Slot | Korean | Hanja | English terms | Required? |
|---|---|---|---|---|
| Choseong | 초성 | 初聲 | initial, onset, leading consonant | yes |
| Jungseong | 중성 | 中聲 | medial, nucleus, vowel | yes |
| Jongseong | 종성 | 終聲 | final, coda, trailing consonant | no |
How the Three Slots Fill a Block
The three slots fill a block in a fixed order: choseong first, then jungseong to its right or below it, then jongseong at the bottom. Where the vowel sits depends on its shape, which is why the slot positions move between syllable block shapes.
- 한: choseong ㅎ, jungseong ㅏ (to the right), jongseong ㄴ (bottom).
- 곡: choseong ㄱ, jungseong ㅗ (below), jongseong ㄱ (bottom).
- 아: choseong ㅇ (silent), jungseong ㅏ, no jongseong.
To practise filling the slots, build syllable blocks step by step.
How Many Letters Fit Each Slot?
Modern Hangul allows 19 letters in choseong, 21 vowels in jungseong and 27 letters in jongseong. Counting "no final" as a 28th option, the slots multiply to 19 × 21 × 28 = 11,172 possible blocks. That exact formula is how Hangul in Unicode encodes every modern syllable.
- Choseong (19): the 14 basic consonants plus ㄲ ㄸ ㅃ ㅆ ㅉ.
- Jungseong (21): 10 basic vowels plus 11 compound vowels such as ㅐ, ㅘ and ㅢ.
- Jongseong (27): 14 basic consonants, ㄲ and ㅆ, and 11 two-letter clusters such as ㄺ. ㄸ, ㅃ and ㅉ never appear here.
Why Do These Terms Matter?
The terms matter because Korean pronunciation rules, typing software and dictionaries all refer to slots. A rule such as "ㅇ is silent in choseong but [ng] in jongseong" needs a name for each position. Korean word games also use them: a 초성 퀴즈 (choseong quiz) gives only initials, such as ㅎㄱ, and players guess 한국 or 한글.
Jongseong vs Batchim
Jongseong and batchim overlap but are not the same. Jongseong is the final slot or the sound heard there; batchim (받침) is the letter written in that slot. The difference shows when spelling and sound part ways.
| Attribute | Jongseong (종성) | Batchim (받침) |
|---|---|---|
| What it names | the final position or sound | the written letter(s) |
| Used by | linguists, Unicode, grammar books | teachers, everyday speech |
| In 닭 | the sound [ㄱ] | the cluster ㄺ |
| Possible forms | 7 sounds | 27 spellings |
Why 27 spellings collapse into seven sounds is explained on the seven final sounds page, and the batchim lesson shows how the final slot reshapes the block. For the single query, the page on jongseong meaning gives the short answer.
Examples of the Three Slots
- 강 (gang, river): 초성 ㄱ, 중성 ㅏ, 종성 ㅇ, pronounced [ng].
- 관 (gwan, tube or office): 초성 ㄱ, 중성 ㅘ, 종성 ㄴ. The compound vowel ㅘ fills one slot.
- 닭 (dak, chicken): 초성 ㄷ, 중성 ㅏ, 종성 ㄺ, pronounced [닥].
Is ㅇ a Consonant or a Placeholder?
Both, depending on the slot. In choseong, ㅇ is a silent placeholder that lets a vowel-initial syllable fill its required first slot, as in 아. In jongseong, ㅇ is a real consonant, [ng], as in 강. The two jobs of the letter ㅇ come from two older letters that later merged.
Common Misconceptions
- "A block with ㅘ has four slots." Actually ㅘ is one vowel and fills one slot.
- "Jongseong and batchim are always the same thing." Actually 닭 has the batchim ㄺ but only one jongseong sound, [ㄱ].
- "Some syllables have no choseong." Actually every written block has one; silent ㅇ fills it.
Related Hangul Terms
- batchim: the written final consonant.
- syllable block shapes: where each slot sits in each layout.
- the Hangul terms glossary: all related definitions.
Once you can label choseong jungseong jongseong in any block, every later rule about Korean sounds becomes easier to follow.
Frequently Asked Questions
Is jungseong always one letter? Jungseong is always one vowel, but that vowel may combine two basic vowel shapes. Compound vowels such as ㅘ in 과 or ㅢ in 의 fill the jungseong slot by themselves, because Korean counts them as single vowels. So 관 still has exactly three slots: ㄱ, ㅘ and ㄴ.
What do linguists call these slots in English? Linguists usually call them onset, nucleus and coda, the general terms for the parts of a syllable in any language. Korean textbooks in English often say initial, medial and final instead. Choseong, jungseong and jongseong are the Korean names, and they also appear in Unicode documents as leading consonant, vowel and trailing consonant.
Does every syllable have a jongseong? No. The jongseong slot is optional. 가, 나, 오 and 미 have no final consonant, while 각, 난, 옷 and 밤 do. Choseong and jungseong are required in every block; if a syllable starts with a vowel sound, the silent letter ㅇ fills the choseong slot, as in 아.
Why is ㅇ written in 아 if it is silent? Hangul requires every block to fill the choseong slot. When a syllable begins with a vowel sound, ㅇ goes there as a silent placeholder, so 아 is ㅇ plus ㅏ. In the jongseong slot the same letter is pronounced [ng], as in 강. The two jobs come from two older letters that merged.
