Romanization of Japanese, commonly called rōmaji (ローマ字), is the practice of writing Japanese words with the Latin or Roman alphabet. It coexists with the native scripts—kanji, hiragana and katakana—and with the use of the Roman alphabet for foreign terms and transliteration. Rōmaji provides a way to render Japanese for readers unfamiliar with Japanese orthography and to enter Japanese on computers and devices.
Major systems and conventions
Several standardized systems exist, each with different priorities. Hepburn romanization aims to represent Japanese pronunciation in a form familiar to English speakers: し is written as "shi." Kunrei-shiki and Nihon-shiki are more systematic and reflect underlying Japanese phonology, writing し as "si." Long vowels are marked in different ways: Hepburn commonly uses macrons (Tōkyō), while others may write the same sequence as "Toukyou" or "Tokyoo." Geminate consonants (a small tsu っ) are indicated by doubling the consonant: "kitte." The moraic nasal ん is written as "n," but its pronunciation and separation rules require care (e.g., "kan'i" vs "kani").
History and standardization
Romanization began in earnest during the contact with the West and accelerated in the Meiji era as Japan modernized. Missionaries and scholars produced early systems; later, the Japanese government adopted official standards for education and administration. International standards and practical variants coexist, so one often encounters multiple acceptable spellings of the same name.
Uses and practical importance
- Language learning: rōmaji helps beginners read and pronounce words before mastering kana and kanji.
- Input methods: most Japanese input systems accept rōmaji to produce kana and kanji, making typing convenient.
- Signage and passports: public signs, maps, and some official documents use rōmaji to assist non-Japanese readers.
- Transcription and search: rōmaji is used in dictionaries, transliteration of proper names, and in contexts where Latin script is required.
Limitations and notable distinctions
Romanization cannot fully capture features such as pitch accent, exact vowel quality, or some moraic distinctions without additional diacritics or explanation. Choices between systems affect readability for foreigners and fidelity to Japanese spelling; for example, the particle は is written and pronounced as "wa" in speech but appears as "ha" in the kana orthography, and romanization sometimes reflects pronunciation ("wa") rather than spelling. When encountering rōmaji, it helps to know which system is being used to interpret pronunciations and to convert text reliably back into kana or kanji.