Meaning
The kanji 単 primarily conveys the meanings of “single,” “simple,” or “unit.” It describes something that stands alone as one component, isn't multiple, and lacks complexity. This kanji is fundamental for understanding many everyday Japanese words related to quantity, structure, and simplicity, making it a key component of your vocabulary.
Its etymological origin is quite fascinating. The original form of 単 (單) was a pictograph depicting a hunting tool, specifically a sling or a single weapon with a net. The top part (similar to 戈, meaning 'halberd' or 'spear') represented the pole or handle. The bottom part, which resembled 田 (meaning 'field'), likely depicted a stylized net or snare. This image of a single, distinct hunting implement then evolved to represent the concept of “single” or “one piece.” Over time, its meaning expanded – as is common with kanji – to encompass “simple” (because a single-component item is often straightforward) and “unit” (as a fundamental, undivided element).
The modern simplified form 単 retains this essence, though it visually abstracts the original components. While it no longer explicitly resembles a hunting tool, its core meaning of singularity and simplicity endures. This 11-stroke kanji is taught in the 4th grade in Japanese schools, making it an N3 level kanji essential for intermediate learners.
Readings
On'yomi (音読み) — Chinese-derived readings
The primary On'yomi reading for 単 is タン. This is by far its most common reading and appears in almost all compound words.
タン is frequently encountered in words where 単 signifies “single,” “simple,” “unit,” or “one-sided.” It's a highly productive reading, combining with other kanji to form a wide array of vocabulary.
単語 (tango) — meaning 'word' (literally, a single unit of language, like 日本語 - Japanese language, or 英語 - English language).
単位 (tan'i) — meaning 'unit' or 'denomination' (e.g., in measurements like キロメートル - kilometer, or as school credits).
単純 (tanjun) — meaning 'simple' or 'uncomplicated' (describing a straightforward design or task).
単数 (tansū) — meaning 'singular number' (like referring to 'a cat' instead of 'cats').
Kun'yomi (訓読み) — Native Japanese readings
The main Kun'yomi reading for 単 is ひとえ.
ひとえ is a less common reading than タン. It's typically found in specific contexts, often related to textiles or layers, and carries the meaning of “single layer” or “unlined.”
単衣 (hitoe) — meaning 'unlined garment' or 'single layer of clothing' (especially referring to a summer kimono worn without a lining).
Used on its own, 単 can also mean 'a single layer,' though its usage is somewhat poetic or very specific, such as describing a single layer of petals.
Common Words & Compounds
To truly master 単, understanding its usage in context is essential. Here are various compound words, categorized to help you see how its meaning expands:
General & Basic Concepts:
単語 (tango) — A word. For example, 'ありがとう' is a single 単語.
単位 (tan'i) — A unit, a denomination. For instance, 'メートル' (meter) is a 単位 of length, or you earn 単位 in school.
単純 (tanjun) — Simple, uncomplicated. Describes something straightforward, like a 単純な作業 (simple task).
単独 (tandoku) — Solo, independent, single-handed. Used when someone is acting alone, like a 単独 行動 (solo action).
Mathematics & Quantity:
単数 (tansū) — Singular number. The opposite of 複数 (plural), like 'a cat' versus 'cats'.
単価 (tanka) — Unit price. The price per single item or unit, such as the 単価 of an apple.
単体 (tantai) — Simple substance, single body/object. Often used in chemistry for elements like 酸素 (oxygen) existing as a 単体.
単利 (tanri) — Simple interest. Financial interest calculated only on the principal amount, unlike compound interest.
Publication & Media:
単行本 (tankōbon) — A standalone book. Often refers to a collected volume of manga or articles previously serialized in magazines, like a complete manga series volume.
単発 (tanpatsu) — Single-shot; sporadic, one-off. Refers to something happening only once, such as a 単発 番組 (one-off TV program).
Describing Layers & Structure:
単層 (tansō) — Single layer, monolayer. Describes a structure with only one layer, like a 単層 細胞 (single-layer cell).
単一 (tan'itsu) — Single, sole, unique. Emphasizes one specific type or element, as in 単一 民族 (single ethnic group).
Example Sentences
この単語の意味がわかりません。
Kono tango no imi ga wakarimasen.
I don't understand the meaning of this word.
学校の単位を取得しました。
Gakkō no tan'i o shutoku shimashita.
I earned school credits.
問題を単純に考えすぎないでください。
Mondai o tanjun ni kangae suginaide kudasai.
Please don't oversimplify the problem.
彼は単独でその仕事を終えた。
Kare wa tandoku de sono shigoto o oeta.
He finished that work by himself.
この文は単数形ですか、複数形ですか。
Kono bun wa tansūkei desu ka, fukusūkei desu ka?
Is this sentence in the singular or plural form?
単価が高いので、たくさん買えません。
Tanka ga takai node, takusan kaemasen.
Since the unit price is high, I can't buy many.
そのマンガは単行本で読みました。
Sono manga wa tankōbon de yomimashita.
I read that manga in its collected volume (standalone book) form.
彼女はいつも単衣の着物を着ています。
Kanojo wa itsumo hitoe no kimono o kiteimasu.
She always wears an unlined kimono.
この機械は単発でしか動かせません。
Kono kikai wa tanpatsu de shika ugokasemasen.
This machine can only be operated in single-shot mode.
Memory Tip
Let's break down 単 to remember it more easily. The top part somewhat resembles 日 (sun) or 田 (rice field), while the bottom part is 十 (ten). Imagine a simple scene: a rice field (田) where only ten (十) stalks of rice are growing. This makes it a very simple field with a single, small harvest. Alternatively, picture a craftsman making a single, simple item with a basic tool. This tool might have a crossbar (十) and a simple head (the upper part). The key is to associate these visual components with the core idea of being 'single' or 'simple' – without multiple parts or complexities.