Meaning
No single kanji weaves through daily Japanese life quite like 気. Its meanings cover spirit, energy, air, mood, and atmosphere. Say good morning, talk about the weather, ask how someone is feeling, warn a friend to be careful — 気 turns up in all of it.
気 descends from the traditional form 氣, a pictographic character depicting steam rising from cooked rice (米). The image was deliberate: from something solid and ordinary (grain) arises something invisible yet vital — warmth, vapor, life force. The character simplified over centuries into modern 気, but its essence remained.
The outer component 气 (きがまえ) is the radical. It represents breath, steam, or flowing air — intangible but undeniably present. This connects to the East Asian concept of qi (気), the vital energy believed to move through the universe and the human body. In Japanese, a person's 気 signals their inner spirit and disposition. The 気 of a place is its atmosphere and feel.
気 has just 6 strokes and belongs to Grade 1, taught in the very first year of Japanese elementary school. From genki (元気, "I'm well!") to ki wo tsukete (気をつけて, "take care"), 気 is present on day one of learning Japanese and never leaves.
Readings
On'yomi (音読み) — Chinese-derived readings
気 has two on'yomi: キ (ki) and ケ (ke), both tracing back to the original Chinese pronunciation. You'll encounter these almost exclusively in compound words (熟語, じゅくご).
キ (ki) is by far the more common reading. It anchors a huge range of everyday compounds — health, weather, emotion, and awareness. When 気 opens a two-kanji compound, it's almost always キ.
- 元気 (genki) — health, vitality, good spirits; the universal "How are you?" word
- 天気 (tenki) — weather; daily vocabulary from the very first lesson
- 気分 (kibun) — mood, how one feels emotionally or physically
ケ (ke) appears in fewer words. It tends to carry a sense of "a trace of" or "a hint of" something — subtle presence rather than full force.
- 気配 (kehai) — sign, presence; sensing someone nearby without seeing them
- 景気 (keiki) — economic conditions; the vitality of the economy
- 色気 (iroke) — sex appeal, a hint of allure
Kun'yomi (訓読み) — Native Japanese readings
The kun'yomi is いき (iki), a native reading that ties 気 directly to breath and life force. It echoes the kanji's pictographic roots — steam rising as a symbol of living energy. This reading is rare in modern everyday speech; it surfaces mainly in literary or classical writing.
- 気息 (ikisoku) — breathing, respiration; used in medical and literary contexts
Common Words & Compounds
気 forms compounds across almost every area of daily life. Here are key groups — the pattern clicks quickly once you see the connections.
Health and Well-being:
- 元気 (genki) — healthy, energetic, in good spirits; the most common 気 compound
- 病気 (byouki) — illness, sickness; literally "the spirit of sickness"
- 気力 (kiryoku) — willpower, mental energy, fighting spirit
Weather and the Natural World:
- 天気 (tenki) — weather; literally "heavenly energy"
- 空気 (kuuki) — air, atmosphere
- 気温 (kion) — air temperature
Feelings and Emotional States:
- 気分 (kibun) — mood, emotional state
- 気持ち (kimochi) — feeling, sensation; more immediate and physical than 気分
- 陽気 (youki) — cheerful, lively; sunny in spirit
- 平気 (heiki) — calm, composed, unfazed
Awareness, Attention, and Intent:
- 気をつける (ki wo tsukeru) — to be careful, to watch out
- 気がする (ki ga suru) — to have a feeling, to sense something
- 本気 (honki) — seriousness, genuine intent; "true spirit"
- 気楽 (kiraku) — carefree, relaxed in spirit
Technology and Society:
- 電気 (denki) — electricity; "lightning energy"
- 人気 (ninki) — popularity; the energy of the people
Example Sentences
今日は天気がいいですね。
Kyou wa tenki ga ii desu ne.
The weather is nice today, isn't it?
元気ですか？
Genki desu ka?
How are you? (Are you doing well?)
気をつけてください。
Ki wo tsukete kudasai.
Please be careful. / Please take care.
彼女は病気で学校を休みました。
Kanojo wa byouki de gakkou wo yasumimashita.
She was absent from school because of illness.
気分はどうですか？
Kibun wa dou desu ka?
How are you feeling?
この部屋の空気が悪いです。
Kono heya no kuuki ga warui desu.
The air in this room is bad.
彼は本気で日本語を勉強しています。
Kare wa honki de nihongo wo benkyou shite imasu.
He is studying Japanese seriously.
電気を消してください。
Denki wo keshite kudasai.
Please turn off the light.
なんとなく気がします。
Nantonaku ki ga shimasu.
I somehow have a feeling about it.
気温が下がって、空気が冷たくなりました。
Kion ga sagatte, kuuki ga tsumetaku narimashita.
The temperature dropped and the air became cold.
Related Kanji
- 空 — Sky, Empty, Air (Kanji N5)
- 三 — Three (Kanji N5)
- 十 — Ten (Kanji N5)
- 二 — Two (Kanji N5)
- 手 — Hand (Kanji N5)
- 一 — One (Kanji N5)
Memory Tip
Picture a pot of rice steaming on a stove. The lid rattles. Steam curls up and fills the kitchen. You can't see it directly, but the air has changed — you feel the warmth, the moisture, the presence.
That's 気. The radical 气 (きがまえ) is literally the shape of rising steam. Inside the original character sat 米 (rice), the source. Steam is physical water made invisible, yet you feel it everywhere. A person's 気 works the same way: real, present, impossible to pin down.
Weather is the 気 of the sky (天気). Electricity is a kind of 気 (電気). Sickness disrupts your 気 (病気). Once you picture the steam, you see 気 everywhere.