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Cardinal | one | |||
Ordinal | 1st (first) |
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Numeral system | unary | |||
Factorization | 1 | |||
Divisors | 1 | |||
Roman numeral | I | |||
Roman numeral (unicode) | Ⅰ, ⅰ | |||
Greek prefix | / | |||
Latin prefix | ||||
Binary | 12 | |||
Ternary | 13 | |||
Quaternary | 14 | |||
Quinary | 15 | |||
Senary | 16 | |||
Octal | 18 | |||
Duodecimal | 112 | |||
Hexadecimal | 116 | |||
Vigesimal | 120 | |||
Base 36 | 136 | |||
Greek numeral | α' | |||
Persian | ١ | |||
Arabic & Kurdish | ١ | |||
Urdu | ||||
Sindhi | ١ | |||
Bengali & Assamese | ১ | |||
Chinese numeral | 一,弌,壹 | |||
Devanāgarī | १ (ek) | |||
Ge'ez | ፩ | |||
Georgian | Ⴁ/ⴁ/ბ(Bani) | |||
Hebrew | א | |||
Kannada | ೧ | |||
Khmer | ១ | |||
Korean | 일, 하나 | |||
Malayalam | ൧ | |||
Thai | ๑ |
1 (one, also called unit, unity, and (multiplicative) identity), is a number, a numeral, and the name of the glyph representing that number. It represents a single entity, the unit of counting or measurement. For example, a line segment of unit length is a line segment of length 1.
The word one can be used as a noun, an adjective and a pronoun.
It comes from the English word an, which comes from the Proto-Germanic root *ainaz. The Proto-Germanic root *ainaz comes from the Proto-Indo-European root *oi-no-.
Compare the Proto-Germanic root *ainaz to Old Frisian an, Gothic ains, Danish een, Dutch een, German eins and Old Norse einn.
Compare the Proto-Indo-European root *oi-no- (which means one, single) to Greek oinos (which means "ace" on dice), Latin unus (one), Old Persian aivam, Old Church Slavonic -inu and ino-, Lithuanian vienas, Old Irish oin and Breton un (one).
One, sometimes referred to as unity, is the first non-zero natural number. It is thus the integer before two and after zero, and the first positive odd number.