一
Meaning in Englishone, number one
Animated kanji stroke order
Related sentences
Word context
What it means
一 (ichi) means 'one' and denotes the basic numerical quantity 1 as well as the abstract idea of singularity or unity; it functions as a standalone numeral, a morpheme in compound words to mark primary/first status, and as the written digit '1' in modern contexts.
Main meanings
- First or primary status when used in compounds or rankings (an ordinal/priority sense distinct from mere counting).
- Unity or whole, used metaphorically to mean 'as one' or 'single entity'.
- In mathematics and algebra the multiplicative identity (the concept of 1 as leaving values unchanged).
- As a neutral written digit representing the numeral 1 in dates, serials and numeric data.
How to use it
Found across spoken and written Japanese: as a digit in numbers and dates, as ichi in Sino-Japanese compounds to mark order or rank, and as hitotsu in native counting; usable in both formal and casual contexts depending on reading and construction, and frequently appears in set phrases and ordinal expressions.
Variants and close terms
- 一つ (hitotsu) - one (native counter for general objects)
- 一番 (ichiban) - the best/first (superlative/ordinal)
- 壱 (ichi) - formal/financial variant used in legal or monetary contexts
- 二 (ni) - two (antonym)
Composition
An atomic kanji composed of a single horizontal stroke representing a single unit; it serves as its own radical, has stroke count one, and does not decompose into smaller semantic components—its shape directly encodes the concept of 'one'.
Etymology
一: the Sino-Japanese On'yomi ichi reflects an Old/Middle Chinese borrowing (phonetic lineage from *yit), while the native Kunyomi hito(tsu) preserves Japan's indigenous counting vocabulary; the two readings coexist because of historical borrowing and adaptation.
Origin
The character entered Japan with Chinese writing around the 5th–6th centuries CE and became one of the earliest and most essential characters used for counting, taxation, calendrical records and administration; its simple single-stroke form made it widely adopted in education and bureaucracy from ancient times onward.
Word class
numeral (数詞)