AskDefine | Define one

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Dictionary Definition

one adj
1 used of a single unit or thing; not two or more; "`ane' is Scottish" [syn: 1, i, ane]
2 particular but unspecified; "early one evening" [syn: one(a)]
3 having the indivisible character of a unit; "a unitary action"; "spoke with one voice" [syn: one(a), unitary]
4 of the same kind or quality; "two animals of one species" [syn: one(a)]
5 used informally as an intensifier; "that is one fine dog" [syn: one(a)]
6 indefinite in time or position; "he will come one day"; "one place or another" [syn: one(a)]
7 being the single appropriate individual of a kind; only; "the one horse that could win this race"; "the one person I could marry" [syn: one(a)]
8 being one in number--a single unit or thing; "one person is going"; "her one thought was to win"; "I'm just one player on the team"; "one day is just like the next"; "seen one horse and you've seen them all" [syn: one(a)]
9 being a single entity made by combining separate components; "three chemicals combining into one solution"
10 eminent beyond or above comparison; "matchless beauty"; "the team's nonpareil center fielder"; "she's one girl in a million"; "the one and only Muhammad Ali"; "a peerless scholar"; "infamy unmatched in the Western world"; "wrote with unmatchable clarity"; "unrivaled mastery of her art" [syn: matchless, nonpareil, one(a), one and only(a), peerless, unmatched, unmatchable, unrivaled, unrivalled]

Noun

1 the smallest whole number or a numeral representing this number; "he has the one but will need a two and three to go with it"; "they had lunch at one" [syn: 1, I, ace, single, unity]
2 a single person or thing; "he is the best one"; "this is the one I ordered"

User Contributed Dictionary

English

Etymology

From an (same word as an), from , from . Cognate with German ein, Dutch een/één, French un, Russian один.

Pronunciation

rfp Australian English requested

Cardinal number

  1. The first number in the set of natural numbers (especially in number theory); the cardinality of the smallest nonempty set.
    There is only one Earth.
    In Western culture, a baby turns one year old a year after its birth.
    One person, one vote.
  2. The ordinality of an element which has no predecessor, usually called first or number one.
  3. Describing a set or group with one component.

Usage notes

Translations

first number
ordinal number
See first and number
set or group with one component
  • Lithuanian: vieneri, vienerios

Pronoun

  1. In the context of "nominative case": Any person or thing.
    One shouldn’t be too quick to judge.
    The big one looks good.
  2. In the context of "accusative case": Any person or thing.
    I want the green one.
    One’s guilt may trouble one.

Synonyms

  • you, they in nominative personal case.

Translations

nominative
accusative
  • ttbc Italian: si, qualcuno
  • ttbc Hindi: not translated "I want the green one" = "हरावाला चाहता हूँ" (the adj. and the verb agree) (literally, "I want the one which is green").

Noun

  1. The neutral element with respect to multiplication in a ring.
  2. The digit or figure 1.
  3. A one-dollar bill.
  4. One run scored by hitting the ball and running between the wickets; a single.

Translations

neutral element in multiplication
  • Danish: et, én, ener
  • Dutch: één
  • Finnish: ykkönen
  • Russian: единица
  • Swedish: etta
digit or figure
  • Bosnian: jedinica
  • Breton: unan
  • Catalan: u
  • Croatian: jedinica
  • Czech: jednička
  • Danish: ettal , ener
  • Dutch: één
  • Esperanto: unu
  • Finnish: ykkönen
  • French: un
  • German: Eins
  • Hungarian: egyes
  • Interlingua: uno
  • Italian: uno
  • Kurdish:
  • Lithuanian: vienetas
  • Polish: jedynka
  • Portuguese: um
  • Romanian: unu
  • Russian: единица
  • Serbian:
    Cyrillic: јединица
    Roman: jedinica
  • Sindhi:
  • Spanish: uno
  • Swedish: etta
  • Tok Pisin: wan
  • Turkish: bir
  • Welsh: un
dollar bill
cricket: single
checktrans-top Translations to be checked ttbc Vietnamese: một, một giờ, cú đấm, một người nào đó, người ta, ai

Adjective

  1. Of a period of time, being particular; as, one morning, one year.
    One day the prince set forth to kill the dragon that had brought terror to his father’s kingdom for centuries.
  2. A single, unspecified thing; a; any.
    My aunt used to say, "One day is just like the other."
  3. Sole, only.
    He is the one man who can help you.
  4. Whole, entire.
    He is one hell of a guy.

Translations

of a period of time
  • Danish: en/et
  • Dutch: op een, eens, ooit
  • Finnish: eräs
  • Korean: 한 (han)
  • Spanish: un
a single, unspecificed thing
  • Danish: den/det ene
  • Dutch: de ene, één
  • Finnish: eräs, yksi
  • Korean: 어느 (eoneu)
  • Spanish: un
sole, only
  • Danish: den/det ene/eneste
  • Dutch: enige, ene
  • Finnish: ainoa
  • Korean: 오직 (ojik), 유일한 (yuirhan)
  • Russian: один (odín), единственный (jedínstv'ennyj), тот самый (tot sámyj)
  • Spanish: único
whole, entire
  • Danish: en/et
  • Dutch: een
  • Finnish: yksi

Derived terms

Bosnian

Pronoun

  1. they

Croatian

Pronoun

  1. they

Declension

Hawaiian

Etymology

Noun

  1. sand

Maori

Etymology

Noun

  1. beach, sand, soil

Synonyms

Polish

Pronunciation

Pronoun

  1. they (third-person plural non-personal nominative pronoun)

Related terms

See also

Rarotongan

Etymology

Noun

  1. sand

Serbian

Pronoun

  1. they

Cyrillic spelling

Slovene

Pronoun

  1. they

Tahitian

Etymology

Noun

  1. sand

Tokelauan

Etymology

Noun

  1. sand

Tuamotuan

Etymology

Noun

  1. sand

Extensive Definition

1 (one) is a number, numeral, and the name of the glyph representing that number. It represents a single entity. One is sometimes referred to as unity or unit as an adjective. For example, a line segment of "unit length" is a line segment of length 1.
In mathematics, it may represent:

Mathematics

For any number x:
x·1 = 1·x = x (1 is the multiplicative identity)
x/1 = x (see division)
x1 = x, 1x = 1, and for nonzero x, x0 = 1 (see exponentiation)
Using ordinary addition, we have 1 + 1 = 2.
One cannot be used as the base of a positional numeral system; sometimes tallying is referred to as "base 1", since only one mark (the tally) is needed, but this is not a positional notation.
The logarithms base 1 is undefined, since 1x=1 and so has no unique inverse function.
In the real number system, 1 can be represented in two ways as a recurring decimal: as 1.000... and as 0.999... (q.v.).
In the Von Neumann representation of natural numbers, 1 is defined as the set . This set has cardinality 1 and hereditary rank 1. Sets like this with a single element are called singletons.
In Principia Mathematica, 1 is defined as the set of all singletons.
In a multiplicative group or monoid, the identity element is sometimes denoted "1", but "e" (from the German Einheit, unity) is more traditional. However, "1" is especially common for the multiplicative identity of a ring. (Note that this multiplicative identity is also often called "unity".)
One is its own factorial, and its own square and cube (and so on, as 1 × 1 × ... × 1 = 1). One is the first figurate number of every kind, such as triangular number, pentagonal number and centered hexagonal number to name just a few.
Because of the multiplicative identity, if f(x) is a multiplicative function, then f(1) must equal 1.
It is also the first and second numbers in the Fibonacci sequence, and is the first number in many mathematical sequences. As a matter of convention, Sloane's early Handbook of Integer Sequences added an initial 1 to any sequence that didn't already have it, and considered these initial 1's in its lexicographic ordering. Sloane's later Encyclopedia of Integer Sequences and its Web counterpart, the On-Line Encyclopedia of Integer Sequences, ignore initial ones in their lexicographic ordering of sequences, because such initial ones often correspond to trivial cases.
One is the empty product.
One is the smallest positive odd integer.
One is a harmonic divisor number.
One is often the internal representation of the Boolean constant true in computer systems.
One is neither a prime number nor a composite number, but a unit, like -1 and, in the Gaussian integers, i and -i. The fundamental theorem of arithmetic guarantees unique factorization over the integers only up to units (e.g. 4 = 22 = (-1)4×123×22).
One was formerly considered prime by some mathematicians, using the definition that a prime is divisible only by one and itself. However, this complicates the fundamental theorem of arithmetic, so modern definitions exclude units. The last professional mathematician to publicly label 1 a prime number was Henri Lebesgue in 1899.
One is one of three possible values of the Möbius function: it takes the value one for square-free integers with an even number of distinct prime factors.
One is the only odd number in the range of Euler's totient function φ(x), in the cases x = 1 and x = 2.
One is the only 1-perfect number (see multiply perfect number).
By definition, 1 is the magnitude or absolute value of a unit vector and a unit matrix (more usually called an identity matrix). Note that the term unit matrix is usually used to mean something quite different.
One is the most common leading digit in many sets of data, a consequence of Benford's law.

List of basic calculations

Evolution of the glyph

The glyph used today in the Western world to represent the number 1, a vertical line, often with a serif at the top and sometimes a short horizontal line at the bottom, traces its roots back to the Indians, who wrote 1 as a horizontal line (in Chinese today this is the way it is written). The Gupta wrote it as a curved line, and the Nagari sometimes added a small circle on the left (rotated a quarter turn to the right, this 9-look-alike became the present day numeral 1 in the Gujarati and Punjabi scripts). The Nepali also rotated it to the right, but kept the circle small. This eventually became the top serif in the modern numeral, but the occasional short horizontal line at the bottom probably originates from similarity with the Roman numeral I. In some European countries (e.g., Germany) the little serif at the top is sometimes extended into a long upstroke, sometimes as long as the vertical line, which can lead to confusion with the glyph for seven in other countries. Where the 1 is written with a long upstroke, the number 7 has a horizontal stroke through the vertical line.
While the shape of the 1 character has an ascender in most modern typefaces, in typefaces with text figures the character usually is of x-height, as, for example, in * The resin identification code used in recycling to identify polyethylene terephthalate.

See also

References

one in Arabic: 1 (عدد)
one in Official Aramaic (700-300 BCE): 1 (ܡܢܝܢܐ)
one in Guarani: Peteĩ
one in Aymara: Maya
one in Belarusian: Лік 1
one in Bosnian: 1 (broj)
one in Bulgarian: 1 (число)
one in Catalan: U (nombre)
one in Chuvash: 1 (хисеп)
one in Cebuano: 1 (numero)
one in Czech: 1 (číslo)
one in Corsican: 1 (numeru)
one in Danish: 1 (tal)
one in Pennsylvania German: Eens
one in German: Eins
one in Erzya: 1 (вейке)
one in Spanish: Uno
one in Esperanto: Unu
one in Basque: Bat
one in Persian: ۱ (عدد)
one in French: 1 (nombre)
one in Gan Chinese: 1
one in Galician: Un
one in Korean: 1
one in Hindi: एक
one in Igbo: Otu
one in Indonesian: 1 (angka)
one in Interlingua (International Auxiliary Language Association): 1 (numero)
one in Xhosa: Inye
one in Icelandic: Einn
one in Italian: 1 (numero)
one in Hebrew: 1 (מספר)
one in Kinyarwanda: Rimwe
one in Haitian: 1 (nonm)
one in Kurdish: Yek
one in Latin: Unus
one in Luxembourgish: Eent
one in Lithuanian: 1 (skaičius)
one in Lombard: Nümar 1
one in Hungarian: 1 (szám)
nah:Cē (tlapōhualli)
one in Dutch: 1 (getal)
one in Dutch Low Saxon: 1 (getal)
one in Japanese: 1
one in Neapolitan: Uno
one in Chechen: Цхьаъ
one in Norwegian: 1 (tall)
one in Norwegian Nynorsk: Talet 1
one in Low German: 1 (Tall)
one in Polish: 1 (liczba)
one in Portuguese: Um
one in Quechua: Huk
one in Russian: 1 (число)
one in Simple English: One
one in Slovenian: 1 (število)
one in Serbian: 1 (број)
one in Finnish: 1 (luku)
one in Swedish: 1 (tal)
one in Tagalog: 1 (bilang)
one in Telugu: ఒకటి
one in Thai: 1
one in Vietnamese: 1 (số)
one in Turkish: 1 (sayı)
one in Ukrainian: 1 (число)
one in Wolof: Benn
one in Yiddish: 1 (נומער)
one in Yoruba: Ení
one in Contenese: 1
one in Dimli: 1 (amor)
one in Chinese: 1

Synonyms, Antonyms and Related Words

Adamite, I, a, a certain, ace, aggregate, alike, all, all one, all the same, all-embracing, all-inclusive, all-knowing, all-powerful, all-seeing, all-wise, almighty, amalgamated, an, any, any one, assimilated, associate, atom, atomic, being, blended, body, boundless, cat, certain, changeless, chap, character, coadunate, coalesce, combinative, combinatory, combined, comprehensive, conjoint, conjugate, conjunctive, connect, connective, consolidated, consubstantial, coupled, creating, creative, creature, customer, duck, duplicate, earthling, eclectic, either, entire, eternal, eternally the same, everlasting, exactly alike, exclusive, exhaustive, fellow, fused, glorious, good, gross, groundling, guy, hallowed, hand, head, highest, holistic, holy, homo, homoousian, human, human being, identic, identical, immortal, immutable, inclusive, incorporated, indistinguishable, individual, indivisible, infinite, integral, integrated, irreducible, joined, joint, joker, just, just alike, life, like, limitless, link, living soul, lone, loving, luminous, majestic, making, man, married, matched, mated, measured, merciful, merged, mixed, monad, monadic, monistic, mortal, no other, none else, nose, nothing else, nought beside, numinous, omnibus, omnipotent, omnipresent, omniscient, one and indivisible, one and only, only, paired, particular, partnered, party, permanent, perpetual, person, personage, personality, quantified, quantitative, quantitive, quantized, radiant, relate, sacred, same, selfsame, separate, shaping, simple, single, singular, sole, solid, solitary, some, somebody, someone, soul, sovereign, supreme, syncretistic, syncretized, synthesized, tellurian, terran, timeless, total, twin, ubiquitous, unanalyzable, unbounded, unchanging, undefined, undifferent, undivided, uniform, unique, unit, unitary, unite, united, universal, unlimited, wed, wedded, whole, without difference, without distinction, worldling
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