Meaning
The kanji 活 (katsu, i.kiru) represents the core ideas of activity, liveliness, and life itself. It signifies a state of being alive, vibrant, and dynamic. This character draws its meaning from the idea of fluid movement and vitality, much like flowing water bringing life to its surroundings.
The kanji 活 is formed from two components: the left radical 氵 (sanzui), meaning 'water,' and the right component 舌 (setsu). While 舌 primarily means 'tongue,' in this context it suggests 'life' or 'movement.' Historically, this combination evoked water bringing things to life or providing animation. Picture water coursing through a river, invigorating everything in its path, making it 'alive' and 'active.' This visual imagery vividly communicates the essence of life's energy and continuous motion, crucial for existence and growth.
With 9 strokes, 活 is typically learned around the 6th grade level in Japanese education, making it an essential character for JLPT N3 students.
Readings
On'yomi (音読み) — Chinese-derived readings
The main On'yomi reading for 活 is カツ (katsu). You'll often find this reading in compound words conveying ideas of activity, life, energy, and effectiveness. It frequently appears in more abstract concepts with a strong Chinese influence. Learning this reading is crucial for understanding many everyday Japanese words.
- 活動 (katsudō) — activity, action, operations. This word describes actions or movements, often in organized contexts like club activities or political campaigns.
- 生活 (seikatsu) — life, living, livelihood. This refers to one's daily routine, lifestyle, or simply the act of existing.
- 活用 (katsuyō) — practical use, application, conjugation (in grammar). This means making effective or practical use of something. For instance, Japanese verb conjugation is called 動詞の活用 (dōshi no katsuyō).
- 活気 (kakki) — liveliness, energy, vigor. This describes an atmosphere or a person full of energy and enthusiasm, like a bustling market or a vibrant individual.
Kun'yomi (訓読み) — Native Japanese readings
The Kun'yomi readings of 活 are more closely tied to native Japanese verbs and adjectives that describe living and giving life.
い.きる (i.kiru) — to live, to be alive, to exist. This fundamental verb refers to the state of being alive. It is often written as 生きる.
生きる (ikiru) — to live, to be alive. Example: 毎日を精一杯生きる (mainichi o seiippai ikiru) — to live each day to the fullest.
生き物 (ikimono) — living creature, organism. Example: 私たちは皆地球上の生き物です (watashi-tachi wa mina chikyūjō no ikimono desu) — We are all living creatures on Earth.
い.かす (i.kasu) — to make good use of, to revive, to keep alive. This transitive verb means utilizing something effectively or bringing it back to life. It is commonly seen as 生かす.
生かす (ikasu) — to make good use of, to keep alive. Example: 自分の経験を生かす (jibun no keiken o ikasu) — to make use of one's experience.
水で花を生かす (mizu de hana o ikasu) — to keep flowers alive with water.
い.ける (i.keru) — to arrange (flowers), to keep alive. This reading is less common, but you'll encounter it in specific contexts, especially related to flower arrangement. It is usually written as 生ける.
花を生ける (hana o ikeru) — to arrange flowers. This means arranging flowers to keep them looking fresh and vibrant.
Common Words & Compounds
The kanji 活 appears in many useful words, each carrying nuances of activity, vitality, and practical application.
- General Activity & Life:
- 活動 (katsudō) — activity, action. Describes the act of moving or performing tasks.
- 生活 (seikatsu) — life, livelihood. Refers to daily life and one's means of livelihood.
- 活発 (kappatsu) — active, lively, vigorous. Describes something or someone full of energy.
- 活躍 (katsuyaku) — activity, great efforts, success. Often used when someone plays an active and significant role.
- 活動的 (katsudōteki) — active, dynamic. An adjective describing an energetic person who enjoys being active.
- Usage & Application:
- 活用 (katsuyō) — practical use, application, conjugation. Making the most of a resource or applying a grammatical form.
- 活用形 (katsuyōkei) — conjugated form (grammar). A specific grammatical term for different verb endings.
- 活字 (katsuji) — movable type, print. Refers to characters used in printing, highlighting their "active" role in communication.
- Liveliness & Energy:
- 活気 (kakki) — energy, liveliness, vigor. The atmosphere of a bustling, vibrant place.
- 活魚 (katsugyo) — live fish. Fish kept alive before being sold or consumed, often seen at markets or restaurants.
- 活性化 (kasseika) — activation, revitalization. The process of making something more active or vigorous, like revitalizing a local economy.
- Other Related Terms:
- 活路 (katsuro) — means of escape, way out of difficulty. A path to survival or recovery, such as finding a new strategy for a struggling business.
- 不活発 (fukappatsu) — inactivity, dullness. The opposite of kappatsu, describing a lack of energy or activity, like an inactive market.
Example Sentences
毎日元気に活動しています。
Mainichi genki ni katsudō shiteimasu.
I am active and energetic every day.
彼は人生を楽しく生きることを心掛けています。
Kare wa jinsei o tanoshiku ikiru koto o kokorogaketeimasu.
He tries to live his life happily.
新しい技術を仕事に活用することは大切です。
Atarashii gijutsu o shigoto ni katsuyō suru koto wa taisetsu desu.
It's important to utilize new technology in your work.
市場は最近、とても活気があります。
Shijō wa saikin, totemo kakki ga arimasu.
The market has been very lively recently.
子どもたちは公園で活発に遊んでいます。
Kodomo-tachi wa kōen de kappatsu ni asondeimasu.
The children are actively playing in the park.
彼は世界で活躍する日本人の一人です。
Kare wa sekai de katsuyaku suru Nihonjin no hitori desu.
He is one of the Japanese people making an impact globally.
水は生物が生きるために不可欠です。
Mizu wa seibutsu ga ikiru tame ni fukaketsu desu.
Water is indispensable for living beings to live.
彼の才能を最大限に生かすと思います。
Kare no sainō o saidaigen ni ikasu to omoimasu.
I want to make the most of his talent.
先生は生徒たちの自発的な活動を奨励しました。
Sensei wa seito-tachi no jihatsuteki na katsudō o shōrei shimashita.
The teacher encouraged the students' voluntary activities.
今後の国際交流で彼が活躍することを期待しています。
Kongo no kokusaikōryū de kare ga katsuyaku suru koto o kitai shiteimasu.
I expect him to play an active role in future international exchanges.
Memory Tip
Imagine the kanji 活 as composed of two powerful elements. On the left is the "water" radical (氵), universally recognized as essential for life and movement. On the right is 舌 (tongue). Think of a fish, or any living creature, actively moving its tongue or gills in water. This symbolizes "life" and "activity." The constant flow of water provides vital energy, making everything in its path dynamic and alive. So, when you see 活, visualize "water" giving "life/movement" to create a sense of being "active," "lively," and "living."