1

← 0 1 2 →
-1 0 1 2 3 4 5 6 7 8 9
Cardinalone
Ordinal1st
(first)
Numeral systemunary
Factorization
Divisors1
Greek numeralΑ´
Roman numeralI
Roman numeral (unicode)Ⅰ, ⅰ
Greek prefixmono-/haplo-
Latin prefixuni-
Binary12
Ternary13
Quaternary14
Quinary15
Senary16
Octal18
Duodecimal112
Hexadecimal116
Vigesimal120
Base 36136
Greek numeralα'
Persian١
Arabic & Kurdish١
Urdu۱
Sindhi١
Bengali & Assamese
Chinese numeral一/弌/壹
Devanāgarī
Ge'ez
Georgian Ⴁ/ⴁ/ბ(Bani)
Hebrewא
Japanese numeral一/壱
Kannada
Khmer
Korean일/하나
Malayalam
Thai
Tamil

1 (one, also called unit, unity, and (multiplicative) identity) is a number, numeral, and glyph. 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. It is also the first of the infinite sequence of natural numbers, followed by 2.

Etymology

The word one can be used as a noun, an adjective and a pronoun.[1]

It comes from the English word an,[1] which comes from the Proto-Germanic root *ainaz.[1] The Proto-Germanic root *ainaz comes from the Proto-Indo-European root *oi-no-.[1]

Compare the Proto-Germanic root *ainaz to Old Frisian an, Gothic ains, Danish en, Dutch een, German eins and Old Norse einn.

Compare the Proto-Indo-European root *oi-no- (which means "one, single"[1]) to Greek oinos (which means "ace" on dice[1]), Latin unus (one[1]), Old Persian aivam, Old Church Slavonic -inu and ino-, Lithuanian vienas, Old Irish oin and Breton un (one[1]).

Other Languages
Afrikaans: 1 (getal)
አማርኛ: አንድ
العربية: 1 (عدد)
ܐܪܡܝܐ: 1 (ܡܢܝܢܐ)
অসমীয়া: ১ (সংখ্যা)
asturianu: Un
Avañe'ẽ: Peteĩ
авар: Цо
Aymar aru: Maya
azərbaycanca: 1 (ədəd)
تۆرکجه: ۱ (سایی)
বাংলা: ১ (সংখ্যা)
Bân-lâm-gú: 1
башҡортса: 1 (һан)
беларуская: 1 (лік)
Bislama: Wan
български: 1 (число)
བོད་ཡིག: ༡ (གྲངས་ཀ།)
bosanski: 1 (broj)
brezhoneg: Unan
català: U (nombre)
Чӑвашла: 1 (хисеп)
Cebuano: 1 (numero)
čeština: 1 (číslo)
chiShona: Motsi
chiTumbuka: Chimoza
Cymraeg: Un
dansk: 1 (tal)
Deitsch: Eens
Deutsch: Eins
eesti: Üks
Ελληνικά: 1 (αριθμός)
emiliàn e rumagnòl: 1 (nùmer)
español: Uno
Esperanto: 1 (nombro)
estremeñu: Unu
euskara: Bat
فارسی: ۱ (عدد)
føroyskt: 1 (tal)
français: 1 (nombre)
Fulfulde: Go’o
furlan: 1 (numar)
Gaeilge: 1 (uimhir)
galego: Un
贛語: 1
ગુજરાતી:
客家語/Hak-kâ-ngî: 1
хальмг: 1
한국어: 1
Hausa: 1
Hawaiʻi: 1 (helu)
Հայերեն: 1 (թիվ)
हिन्दी: १ (संख्या)
hrvatski: Jedan
Igbo: Otu
Ilokano: 1 (bilang)
Bahasa Indonesia: 1 (angka)
interlingua: 1 (numero)
Iñupiak: Atausiq
isiXhosa: Inye
íslenska: Einn
italiano: 1 (numero)
עברית: 1 (מספר)
ಕನ್ನಡ: ಒಂದು
ქართული: 1 (რიცხვი)
қазақша: 1 (сан)
Kinyarwanda: Rimwe
Kirundi: Rimwe
Kiswahili: Moja
коми: 1 (ӧти)
Kreyòl ayisyen: 1 (nonm)
kurdî: Yek
лакку: Цава
Latina: Unus
latviešu: 1 (skaitlis)
Lëtzebuergesch: Eent
lietuvių: 1 (skaičius)
Limburgs: Ein
lingála: Mɔ̌kɔ́
Luganda: Emu
lumbaart: Nümar 1
magyar: 1 (szám)
मैथिली:
македонски: 1 (број)
മലയാളം: 1 (അക്കം)
मराठी: १ (संख्या)
მარგალური: ართი
Bahasa Melayu: 1 (nombor)
Mìng-dĕ̤ng-ngṳ̄: 1
မြန်မာဘာသာ:
Na Vosa Vakaviti: Dua
Nederlands: 1 (getal)
Nedersaksies: 1 (getal)
日本語: 1
Napulitano: Uno
нохчийн: Цхьаъ
Nordfriisk: Ian
norsk: 1 (tall)
norsk nynorsk: Talet 1
ଓଡ଼ିଆ: ୧ (ସଂଖ୍ୟା)
oʻzbekcha/ўзбекча: 1 (son)
ਪੰਜਾਬੀ: ੧ (ਅੰਕ)
پنجابی: اک
پښتو: ۱
Перем Коми: 1 (ӧтік)
ភាសាខ្មែរ: ១ (លេខ)
Plattdüütsch: 1 (Tall)
polski: 1 (liczba)
português: Um
Qaraqalpaqsha: 1
română: 1 (cifră)
Runa Simi: Huk
русский: 1 (число)
саха тыла: Биир (ахсаан)
ᱥᱟᱱᱛᱟᱲᱤ: ᱑ (ᱢᱤᱫ)
Gagana Samoa: 1 (numera)
Scots: 1 (nummer)
Sesotho sa Leboa: 1 (nomoro)
shqip: 1 (numër)
Simple English: 1 (number)
slovenčina: 1 (číslo)
slovenščina: 1 (število)
ślůnski: 1 (nůmera)
Soomaaliga: 1 (tiro)
کوردی: ١ (ژمارە)
Sranantongo: Numro 1
српски / srpski: 1 (број)
srpskohrvatski / српскохрватски: 1 (broj)
suomi: 1 (luku)
svenska: 1 (tal)
Tagalog: 1 (bilang)
தமிழ்: 1 (எண்)
татарча/tatarça: 1 (сан)
తెలుగు: ఒకటి
ไทย: 1
ትግርኛ: ሓደ
тоҷикӣ: 1 (адад)
Tshivenda: Thihi
ತುಳು: ಒಂಜಿ
Türkçe: 1 (sayı)
Türkmençe: 1 (san)
Twi: 1
тыва дыл: 1
ᨅᨔ ᨕᨘᨁᨗ: 1 (nomoro)
українська: 1 (число)
اردو: 1 (عدد)
Vahcuengh: It
vepsän kel’: 1 (lugu)
Tiếng Việt: 1 (số)
文言:
West-Vlams: 1 (getal)
Winaray: 1 (ihap)
Wolof: Benn
吴语: 1
Xitsonga: N'we
ייִדיש: 1 (נומער)
Yorùbá: 1 (nọ́mbà)
粵語: 1
Zazaki: 1 (amar)
中文: 1
Bahasa Hulontalo: 1
ГӀалгӀай: 1