On'yomi and Kun'yomi

Every kanji in Japanese can have one or more readings: on'yomi (音読み, Chinese-derived) and kun'yomi (訓読み, native Japanese). Understanding when and why each reading is used is fundamental to kanji mastery.

What Are On'yomi and Kun'yomi?

On'yomi (音読み) — "Sound Reading"

On'yomi are Japanese approximations of Chinese pronunciations at the time kanji were imported. Since different historical periods brought different Chinese dialects, some kanji have multiple on'yomi from different eras:

• Go-on (呉音): From southern Chinese dialects, earlier import (~5th–6th century)
• Kan-on (漢音): From northern Chinese dialects, main Tang Dynasty import (~7th–8th century)
• Tō-on (唐音): Zen Buddhism period imports (~9th–14th century)

In practice, most learners encounter kanji with 1–2 on'yomi.

Notation in dictionaries: On'yomi are listed in katakana (e.g., ショク, ジキ)

Kun'yomi (訓読み) — "Meaning Reading"

Kun'yomi are the original native Japanese words (大和言葉, yamato kotoba) that were assigned to kanji based on shared meaning. When Japanese speakers adopted Chinese characters, they mapped them onto existing Japanese words.

Notation in dictionaries: Kun'yomi are listed in hiragana, with a period (·) before okurigana: た.べる, たか.い

When Each Reading Is Used

Use On'yomi When:

1. Two or more kanji appear together in a compound (熟語 jukugo):

   • 電車 (densha) = でんしゃ [電 DEN + 車 SHA]
   • 学校 (gakkou) = がっこう [学 GAKU + 校 KOU]
   • 経済 (keizai) = けいざい [経 KEI + 済 ZAI]

2. Formal/academic vocabulary:

   • 文化 (bunka, culture), 社会 (shakai, society), 環境 (kankyou, environment)

3. The kanji is followed by no okurigana in a compound context

Use Kun'yomi When:

1. A single kanji appears alone (often as a verb, adjective, or standalone noun):

   • 山 alone = やま (yama, mountain)
   • 木 alone = き (ki, tree)
   • 水 alone = みず (mizu, water)

2. Kanji is followed by okurigana (hiragana suffixes that complete the word):

   • 食べる (taberu) = 食 (ta) + べる (okurigana)
   • 高い (takai) = 高 (taka) + い (okurigana)
   • 書く (kaku) = 書 (ka) + く (okurigana)

3. Japanese proper nouns (people's names, place names):

   • 田中 (Tanaka): 田 = た, 中 = なか
   • 山田 (Yamada): 山 = やま, 田 = だ
   • Note: name readings are often unique — a separate "name reading" category (名乗り, nanori) exists

Multiple On'yomi Examples

Some kanji have two common on'yomi used in different compound contexts:

Irregular Readings (熟字訓 Jukujikun)

Some compound words have readings that do not correspond to individual kanji readings — the reading applies to the whole word:

Counter Readings

Numbers use special readings in some contexts:

Learning Strategy

1. Accept multiple readings from day one: Don't try to memorize all readings for a kanji upfront. Learn the most common reading first, then add others as you encounter them in vocabulary.

2. Use vocabulary as the vehicle: Instead of memorizing "食 = ショク/ジキ/た.べる/く.らう", just learn 食べる (taberu), 食堂 (shokudou), 食事 (shokuji) as separate vocabulary items. The readings emerge naturally.

3. Notice okurigana patterns: If hiragana follows a kanji, it's likely kun'yomi. If it's two kanji directly together, it's likely on'yomi.

4. Compound heuristic: When two or more kanji are together with no hiragana between them, assume on'yomi until proven otherwise.

5. Context clues: 食 followed by べる = taberu (kun); 食 followed by 堂 = shokudou (on). Context is always the final arbiter.