一
부수: 一
획수: 1획
一 has the meanings one, single, first and unity.

一 = 一
X = semantic
• 一 has been suggested to depict a single finger. Clearly, this represents ‘one’.
Evolution:
一 = one ➔ single
一 = one ➔ first
一 = one ➔ unity
Mnemonic
一 = 1 finger.
Vocabulary
一 | 일 | one |
一月 | 일월 | January |
一酸化炭素 | 일산화 탄소 | carbon monoxide |
一口二言 | 일구이언 | two-faced |
萬一 | 만일 | supposing (via metaphor) |
單一 | 단일 | single |
一回用 | 일회용 | single-use |
一般 | 일반 | general; ordinary |
一部 | 일부 | a part; portion |
一種 | 일종 | a kind; a sort |
同一 | 동일 | sameness |
一見 | 일견 | a glance (single look) |
一旦 | 일단 | ‘first of all’ |
第一 | 제일 | the first; most |
一等 | 일등 | first-class; first grade |
一大 | 일대 | remarkable; great |
一人稱 | 일인칭 | first-person perspective |
一致 | 일치 | agreement |
統一 | 통일 | unification |
劃一 | 획일 | uniformity; standardisation |
合一 | 합일 | unity; oneness |
一切 | 일체 | all; everything; the whole |
一齊 | 일제 | all together at once |
不一致 | 불일치 | disagreement; discord |
Other resources
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Wikitionary
Unihan Database
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ZDic
CC-Canto
Chinese Text Project
The Chinese University of Hong Kong (etymology)
Chinese Boost
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Takoboto
Jisho
JLearn.net
Sakura
The Kanji Map
Sentence Search
Immersion Kit
Vietnamese
Bibliography
— Daum 사전, [s.v. 一].
— Grant, B.K. (1982). A Guide To Korean Characters: Reading and Writing Hangul and Hanja, [s.v. 1]. Seoul: Hollym.
— Outlier Dictionary of Chinese Characters, [s.v. 一].
— Seely, C., Henshall, K.G., & Fan, J. (2016). The Complete Guide to Japanese Kanji: Remembering and Understanding the 2,136 Standard Japanese Characters, [s.v. 1]. Singapore: Tuttle Publishing.