Meaning
The kanji 恒 (KŌ, tsune, tokoshie) primarily conveys 'constant,' 'regular,' 'always,' or 'permanence.' It signifies something stable, unchanging, and perpetual over time, representing a continuous and unwavering state. This kanji frequently describes enduring qualities, consistent patterns, or eternal concepts.
Understanding the kanji's etymological roots clarifies its core meaning. 恒 is an ideograph, representing an idea through its visual components. It combines two main elements: 亘 (wataru) and 心 (kokoro).
亘 serves as both a phonetic component and signifies 'to extend across,' 'to span,' or 'throughout.' This component visually suggests continuity—something stretching or permeating a given space or duration. Meanwhile, 心 means 'heart' or 'mind.'
When paired with 心 (heart/mind), 恒 evokes the image of a deeply rooted, enduring state or quality. This combination implies an inherent stability across time or circumstances, thus conveying constancy and permanence.
This 9-stroke kanji is a Jōyō Kanji, though it isn't assigned to a specific elementary school grade. Students typically learn 恒 in secondary education, reflecting its slightly more abstract and formal usage compared to kanji taught in earlier grades.
Readings
On'yomi (音読み) — Chinese-derived readings
The on'yomi readings of 恒 are derived from ancient Chinese pronunciations and are predominantly used when 恒 appears as part of a compound word, often alongside other kanji.
コウ (KŌ): This is the primary on'yomi reading for 恒. It appears frequently in academic, technical, and formal vocabulary to denote concepts of constancy, fixedness, or eternity.
恒久 (koukyuu) — eternity, permanence, perpetuity (e.g., in discussions of peace or stability)
恒常 (koujou) — constancy, regularity, normality (e.g., describing a constant state or habitual action)
恒星 (kousei) — fixed star (a star like our Sun, which appears to maintain a fixed position relative to other stars, emphasizing its constancy)
Kun'yomi (訓読み) — Native Japanese readings
The kun'yomi readings of 恒 are native Japanese pronunciations. They are often used when the kanji stands alone or is followed by okurigana (hiragana endings), typically in more literary or classical contexts.
つね (tsune): This reading carries the meaning of "always," "habitual," or "ordinary." While less common for 恒 alone compared to its synonym 常 (tsune), it does appear in specific phrases and literary expressions, emphasizing a consistent or usual state.
恒の日 (tsune no hi) — an ordinary day, everyday (a more classical or literary expression)
恒ならぬ (tsunenaranu) — unusual, extraordinary (a descriptive adjective phrase indicating something that is not constant or normal)
恒に (tsune ni) — always, habitually (though commonly written with 常, 恒 can be seen in older texts)
とこしえ (tokoshie): This reading conveys the powerful meaning of "eternity" or "perpetuity." It is often used in a more poetic or profound sense, signifying something that lasts forever.
恒 (tokoshie) — eternity, forever (often used standalone as a noun)
恒に (tokoshie ni) — eternally, forevermore (adverbial form)
恒の平和 (tokoshie no heiwa) — eternal peace (a phrase expressing lasting peace)
Common Words & Compounds
Here are some common words and compounds using 恒, categorized by their thematic usage to help you grasp their meanings and contexts:
Concepts of Permanence & Regularity:
恒久 (koukyuu) — permanence, eternity, perpetuity
恒常 (koujou) — constancy, regularity, normality
恒久平和 (koukyuu heiwa) — permanent peace
恒久化 (koukyuuka) — perpetuation, making permanent, stabilization
恒常的 (koujouteki) — constant, regular, habitual (adjectival form)
Science & Mathematics:
恒星 (kousei) — fixed star (celestial body that emits its own light)
恒温 (kouon) — constant temperature, homeothermy
恒温動物 (kouon dōbutsu) — warm-blooded animal
恒速度 (kousokudo) — constant velocity
恒等式 (koutoushiki) — identity (mathematics, an equation that is always true)
Custom & Established Practice:
恒例 (kourei) — established practice, custom, annual event (e.g., a customary yearly gathering)
Classical/Proverbial Use:
恒産 (kousan) — permanent property, fixed occupation (often seen in the proverb 恒産なくして恒心なし - without permanent property, there is no constancy of mind)
Example Sentences
この地域の恒久な平和を願っています。
Kono chiiki no koukyuu na heiwa o negatteimasu.
I wish for lasting peace in this region.
お客様へのサービスは恒常的に改善されます。
Okyaku-sama e no sābisu wa koujouteki ni kaizen saremasu.
Our customer service is constantly being improved.
太陽は私たちの系で最も近い恒星です。
Taiyou wa watashi-tachi no kei de mottomo chikai kousei desu.
The Sun is the closest fixed star in our system.
彼は毎年この時期に恒例の挨拶をします。
Kare wa maitoshi kono jiki ni kourei no aisatsu o shimasu.
He gives his customary greeting every year at this time.
研究室では温度を恒温に保つ必要があります。
Kenkyūshitsu de wa ondo o kouon ni tamotsu hitsuyou ga arimasu.
It is necessary to maintain a constant temperature in the laboratory.
宇宙には数多の恒星が輝いている。
Uchū ni wa amata no kousei ga kagayaiteiru.
Countless fixed stars shine in the universe.
この真理は恒に変わらないでしょう。
Kono shinri wa tokoshie ni kawaranai deshō.
This truth will eternally remain unchanged.
健康のためには恒常的な運動が不可欠だ。
Kenkō no tame ni wa koujouteki na undō ga fukaketsu da.
Consistent exercise is indispensable for health.
Memory Tip
To remember 恒, consider its components: 亘 (to span, throughout) and 心 (heart/mind). Imagine your heart beating steadily, a constant and unchanging rhythm that spans your entire life. Alternatively, picture a deeply held belief within your heart that remains 'constant' and 'permanent' through all your thoughts and actions, extending across every situation. The upper part, 亘, resembles a bridge or something extending over a long distance, while 心, the heart radical, is at the bottom. Together, they create the image of something enduring or spanning one's core being, symbolizing constancy and everlasting presence.