one
Noun pluralones
Pluralones
- 1
- 2A single member of a group, or a particular person or thing among others, including the first of two as against the other.
Each one of these boxes needs a label.
One of my neighbors found our missing cat asleep in her garage.
UsageOne of + a plural noun, with a singular verb: one of my friends is here (not
incorrect: one of my friend).Note
The pronoun that picks a member out of a group, and it can stand in for a countable noun already mentioned: Do you have a pen? Sorry, I don't have one.
- 3Used in place of a noun or noun phrase that the context makes clear, often after an adjective, as in the red one or I owe you one.
If you can cover my shift on Saturday, I'll owe you one.
In the third round, the boxer finally landed one squarely on his opponent's jaw.
UsageThe plural is ones: the old ones, which ones?
Note
What one means here is settled entirely by the situation: a favor in I'll owe you one, a punch when a boxer lands one. That openness sets it apart from the "drink" sense and the "joke" sense, where the meaning stays fixed whatever the context.
- 4The number 1, the first and smallest positive whole number, used in counting.
She counted slowly down from ten to one before opening her eyes.
The score was one to nothing at half time.
UsageOne + a singular noun (one hour), but one and a half + a plural: one and a half hours.
Note
As a number it counts anything, including age (a baby turns one). In the slogan one person, one vote, it stands before each noun to insist on an exact, equal count.
Checked 3 Nov 2026 · 1 fact
- The slogan has the wording “one person, one vote”. en.wiktionary.org
- 5Single but unspecified; some or a certain, as in naming a particular but unnamed day or time in a story.
One evening, a stranger knocked on our door and asked for directions.
One morning in March, the letter she had waited years for finally arrived.
UsageOne day often points to the future: one day I'll visit Japan. Some day is similar.
- 6Any person or people in general, used as a more formal generic 'you'.
One never knows what the weather will do here.
One can see the whole valley from the top of the hill.
UsageKeep to one's and oneself once you start: one does one's best. In everyday speech, you is far more common.
Similaryou
Note
The formal way of speaking about everybody at once, a more careful cousin of generic you. Writers of reflective prose such as Richard Jefferies used it to set the reader inside a scene: as one sat on the sward.
Checked 2 Nov 2026 · 1 fact
- Richard Jefferies used the quoted wording in descriptive prose; it occurs in the narration of The Amateur Poacher, chapter I. gutenberg.org
- 7Any person, entity, or thing, used in definitions and descriptions.
A borrower is one who takes something and promises to give it back.
A pessimist is one who always expects the worst to happen.
UsageUsually one who + verb: one who expects the worst. In everyday speech, someone who is more usual.
- 8Used after a noun as a label for the first in a numbered series, as in page one or day one.
The scandal was on page one of every newspaper in the country.
She knew from day one that the job would not be easy.
UsageAfter the noun: page one, day one, from day one. Before the noun, use first: the first page.
Note
Here the number answers which rather than how many: it names the first item in a numbered series. That position is what separates it from the plain counting number.
Less common meanings
- 9The ideal partner, or the person or thing that is exactly right, used with the.
After three years of looking, this house is the one.
Everyone asks how you know when you've met the one.
UsageCommon in meet the one and is this the one?
- 10The hour of 1 o'clock, a.m. or p.m., with 'o'clock' left out.
The staff canteen serves hot lunches from twelve until one every weekday.
I couldn't put the book down and was still reading at one in the morning.
UsageAdd o'clock only for the exact hour: at one or at one o'clock, but half past one.
Note
Clock time with o'clock left unsaid. The bare number fits every way of telling the hour: one in the morning, half-past one, from one to two. It is long-settled usage. In Mary Shelley's Frankenstein it is already one in the morning when the creature's dull yellow eye opens.
Checked 31 Oct 2026 · 3 facts
- The use of one for clock time without o'clock is long established, appearing in the original 1818 text of Frankenstein. gutenberg.org
- Mary Shelley wrote Frankenstein. gutenberg.org
- In Frankenstein, it is already one in the morning when the creature's dull yellow eye opens. gutenberg.org
- 11Used for emphasis to mark a striking or outstanding example of something.
That is one big dog you've got there.
It was one strange conversation.
UsageAn adjective usually comes between: one big dog, one strange day. Also one hell of a + noun.
Note
Emphasis created by standing in for a: one hell of a guy is a stronger way of saying a hell of a guy. The number counts nothing here.
- 12A joke or funny story, usually followed by about and its subject.
Stop me if you've heard this one.
That's an old one that my grandfather used to tell at every family dinner.
UsageOften in the one about ... and heard this one.
Similarjoke
Note
A joke that has lost its noun and kept its frame: the one about… is how a joke announces itself. Because the frame does the work, the noun never comes back. Both have you heard the one about the penguin in the lift? and stop me if you've heard this one are understood at once.
- 13An alcoholic drink, especially a beer.
Let's grab a cold one at the bar after the game.
Just one, then I'm driving home.
UsageUsually with an adjective: a quick one, a cold one.
Similardrink
Note
Drink talk with the drink left out: the adjective says what kind, and the number simply counts it. Context alone tells the listener that the one in question is alcoholic, most often a beer.
- 14A bill worth a single dollar, the note itself rather than the sum.
The cashier ran out of ones by noon.
Do you have a one for the parking machine?
UsageA one (not
incorrect: an one), plural ones: five ones.Similarsingle
Note
American money talk names a bill by its value and drops the word bill. It refers to the note itself, so a cashier who needs ones to make change wants the paper, not simply a dollar's worth.
- 15
- 16
- 17The digit or figure 1 as a written or stored symbol.
On the old scoreboard, the ones were hard to tell from the sevens.
He mistook the seven for a one.
Note
A mark on the page or in a machine, not the amount it stands for: the number is the quantity, and this is its written figure. As a noun it takes a plural, which is how talk of binary computing comes to speak of zeroes and ones.
Checked 31 Oct 2026 · 1 fact
- Binary computers store and process data using bits described as zeros and ones. ibm.com
- 18
- 19Used before a name to mark the person as otherwise unknown; a certain.
The letter was signed by one J. Harper, clerk.
A complaint was lodged by one Thomas Reed of this parish.
UsageMainly formal or humorous, in records and reports: one Mr. Smith.
Note
A name introduced at arm's length. Placed before it, the word signals that the writer knows the name and nothing more, much like a certain. It suits records and reports, and it can be played for effect: picture a report that one A. Lincoln spent a night in a town jail in 1843, which leaves the reader to supply who he became.
- 20A person given to something, or the type who does it, used with for.
I'm not one for parties, I'd rather read.
He was one for long walks whatever the weather.
UsageMost often not one for + noun or -ing: I'm not one for parties.
Note
A person defined by a habit, in a fixed construction: for, then a noun or an -ing form. In the positive it can keep an article that sounds odd before a number: H. G. Wells has a character in Kipps say you are a one for being roundabout.
Checked 2 Nov 2026 · 1 fact
- Kipps is by H. G. Wells, and a character, Flo, says the quoted words. gutenberg.net.au
- 21Used after an adjective to address someone, ironically or affectionately.
Come here, little one.
Lead on, wise one, we'll follow.
UsageUsed without an article in direct address, most commonly in the affectionate phrase little one for a child.
Note
A way of speaking to someone through an adjective: the adjective names a quality, and the word fills the place of the noun, as in most merciful one or sleepy one. The register swings widely. In solemn address it is archaic; in everyday speech it turns ironic or affectionate, so hey, sleepy one teases rather than flatters.
- 22A euphemistic and often derogatory term for a gay man.
Nobody said the word 'gay'; they just asked whether he was one.
In the old play, a gossiping neighbor hints that the bachelor upstairs is one, and everyone knows what she means.
Note
A coded euphemism that depends on what is left unsaid: is he one asks the listener to supply the noun. Because it marks a person as a type to be whispered about, it can carry contempt. It is worth recognizing in older writing, such as Dorothy Parker's 1933 diarist asking what do I care if he is one?, but it is not for current use.
Checked 2 Nov 2026 · 2 facts
- Dorothy Parker wrote the diary sketch, which was first published in 1933. newyorker.com
- The fictional diarist asks 'what do I care if he is one?' fadedpage.com
- 23To unite or join into a single whole.
And both shall be oned in eternal happiness.
2000, Carolyn Baker, The Journey of Forgiveness: Fulfilling the Healing Process - 24In mathematics, the multiplicative identity of a ring: the element that leaves any other unchanged when multiplied by it.
- 25In cricket, a single run, scored by hitting the ball and running once between the wickets.
- 26A single act of having sex, as in "a quick one."
- 27In Singapore and Malaysian English, a sentence-final particle that stresses a typical trait or habit of a person or thing.
- 28In Singapore and Malaysian English, a particle ending a sentence to stress who made or did something.
- 29In Singapore and Malaysian English, a sentence-final particle stressing that something tends to happen or is sure to, as part of its nature.
- 30In Singapore and Malaysian English, a particle that lets a describing phrase stand alone as a noun, with no main noun stated.
- 31In Singapore and Malaysian English, a word placed after a relative clause to mark it, like "who" or "that."
Showing meanings only.
Practice
Can you tell the meanings of one apart? Answer 3 quick questions from this page, or write your own sentence and AI will check it.
Origin
Proto-Indo-European *h₁óynos ("single, one") led to Proto-Germanic *ainaz ("one") and Proto-West Germanic *ain, then to Old English ān ("one") and Middle English oon. Related words include Dutch een, German ein, and Latin ūnus, and a and an are doublets. The unrelated French on may have shaped its use as an indefinite pronoun, even though related words serve this purpose widely across the Germanic languages.
Checked 1 Nov 2026 · 7 facts
- The stated reconstructed forms, meanings, and descent through Old and Middle English are supported. en.wiktionary.org
- Dutch een and German ein are cognates of English one. en.wiktionary.org
- Latin ūnus is a cognate of English one. en.wiktionary.org
- English a and an share their origin with one and are doublets. en.wiktionary.org
- French on has a different etymological origin from English one. en.wiktionary.org
- French on may have influenced the development of indefinite-pronoun one. en.wikipedia.org
- Cognates of one widely have the same pronominal function in Germanic languages. en.wiktionary.org