On'yomi

On'yomi (音読おんよみ, [oɰ̃jomi], lit. "sound(-based) reading"), or the Sino-Japanese reading, is the reading of a kanji based on the historical Chinese pronunciation of the character. A single kanji might have multiple on'yomi pronunciations, reflecting the Chinese pronunciations of different periods or regions. On'yomi pronunciations are generally classified into go-on, kan-on, tō-on and kan'yō-on, roughly based on when they were borrowed from China.

Generally, on'yomi pronunciations are used for technical, compound words, while the native kun'yomi pronunciation is used for singular, simpler words.

Usage

On'yomi primarily occur in multi-kanji compound words (熟語じゅくご, jukugo), many of which are the result of the adoption, along with the kanji themselves, of Chinese words for concepts that either did not exist in Japanese or could not be articulated as elegantly using native words. This borrowing process is often compared to the English borrowings from Latin, Greek, and Norman French, since Chinese-borrowed terms are often more specialized, or considered to sound more erudite or formal, than their native counterparts (occupying a higher linguistic register). The major exception to this rule is family names, in which the native kun'yomi are usually used (though on'yomi are found in many personal names, especially men's names).

Kanji invented in Japan (kokuji) would not normally be expected to have on'yomi, but there are exceptions, such as the character 働はたらけ "to work", which has the kun'yomi "hatara(ku)" and the on'yomi "dō", and 腺せん "gland", which has only the on'yomi "sen"—in both cases these come from the on'yomi of the phonetic component, respectively 動どう "dō" and 泉いずみ "sen".

Characteristics

In Chinese, most characters are associated with a single Chinese sound, though there are distinct literary and colloquial readings. However, some homographs (多た音字おんじ) such as 行くだり (Mandarin: háng or xíng, Japanese: an, gō, gyō) have more than one reading in Chinese representing different meanings, which is reflected in the carryover to Japanese as well. Additionally, many Chinese syllables, especially those with an entering tone, did not fit the largely consonant-vowel (CV) phonotactics of classical Japanese. Thus most on'yomi are composed of two morae (beats), the second of which is either a lengthening of the vowel in the first mora (to ei, ō, or ū), the vowel i, or one of the syllables ku, ki, tsu, chi, fu (historically, later merged into ō and ū), or moraic n, chosen for their approximation to the final consonants of Middle Chinese. It may be that palatalized consonants before vowels other than i developed in Japanese as a result of Chinese borrowings, as they are virtually unknown in words of native Japanese origin, but are common in Chinese.

Classification

Generally, on'yomi are classified into four types according to their region and time of origin:

• Go-on (呉音ごおん, "Wu sound") readings derive from the pronunciation used in the Northern and Southern dynasties of China during the 5th and 6th centuries, primarily from the speech of the capital Jiankang (today's Nanjing). They are related to Wu Chinese and the Shanghainese language.
• Kan-on (漢音かんおん, "Han sound") readings come from the pronunciation utilized during the Tang dynasty of China in the 7th to 9th centuries, primarily from the standard speech of the capital, Chang'an (modern Xi'an). Here, Kan refers to Han Chinese people or China proper.
• Tō-on (唐音とういん, "Tang sound") readings are based on the pronunciations of later dynasties of China, such as the Song and Ming. They cover all readings adopted from the Heian era to the Edo period. This is also known as Tōsō-on (唐から宋音そうおん, Tang and Song sound).
• Kan'yō-on (慣用音かんようおん, "customary sound") readings, which are mistaken or changed readings of the kanji that have become accepted into the Japanese language. In some cases, they are the actual readings that accompanied the character's introduction to Japan but do not match how the character "should" (is prescribed to) be read according to the rules of character construction and pronunciation.

The most common form of readings is the kan-on one, and use of a non-kan-on reading in a word where the kan-on reading is well known is a common cause of reading mistakes or difficulty, such as in ge-doku (解毒げどく, detoxification, anti-poison) (go-on), where 解かい is usually instead read as kai. The go-on readings are especially common in Buddhist terminology such as gokuraku (極楽ごくらく, paradise), as well as in some of the earliest loans, such as the Sino-Japanese numbers. The tō-on readings occur in some later words, such as isu (椅子いす, chair), futon (布団ふとん, mattress), and andon (行灯あんどん, a kind of paper lantern). The go-on, kan-on, and tō-on readings are generally cognate (with rare exceptions of homographs; see below), having a common origin in Old Chinese, and hence form linguistic doublets or triplets, but they can differ significantly from each other and from modern Chinese pronunciation.

Examples

Examples (rare readings in parentheses)

Kanji	Meaning	Go-on	Kan-on	Tō-on	Kan'yō-on	Middle Chinese
明あきら	bright	myō	mei	(min)	—	mjang
行くだり	go	gyō gō	kō kō	(an)	—	haengH
極ごく	extreme	goku	kyoku	—	—	gik
珠たま	pearl	shu	shu	ju	(zu)	tsyu
度ど	degree	do	(to)	—	—	duH, dak
輸	transport	(shu)	(shu)	—	yu	syu
雄ゆう	masculine	—	—	—	yū	hjuwng
熊くま	bear	—	—	—	yū	hjuwng
子こ	child	shi	shi	su	—	tsiX
清きよし	clear	shō	sei	(shin)	—	tshjeng
京きょう	capital	kyō	kei	(kin)	—	kjaeng
兵へい	soldier	hyō	hei	—	—	pjaeng
強つよ	strong	gō	kyō	—	—	gjangX

See also

• Kun'yomi
• Kanji