one

¹

[ wuhn ]

adjective

1. being or amounting to a single unit or individual or entire thing, item, or object rather than two or more; a single:

   one woman;

   one nation;

   one piece of cake.

2. being a person, thing, or individual instance or member of a number, kind, group, or category indicated:

   one member of the party.

3. existing, acting, or considered as a single unit, entity, or individual.
4. of the same or having a single kind, nature, or condition: We are of one resolve.

   We belong to one team.

   We are of one resolve.

5. noting some indefinite day or time in the future:

   You will see him one day.

6. a certain (often used in naming a person otherwise unknown or undescribed):

   One John Smith was chosen.

7. being a particular, unique, or only individual, item, or unit:

   I'm looking for the one adviser I can trust.

8. noting some indefinite day or time in the past:

   We all had dinner together one evening last week.

9. of no consequence as to the character, outcome, etc.; the same:

   It's all one to me whether they go or not.

noun

1. the first and lowest whole number, being a cardinal number; unity.
2. a symbol of this number, as 1 or I.
3. a single person or thing:

   If only problems would come one at a time!

4. a die face or a domino face having one pip.
5. a one-dollar bill:

   to change a five-dollar bill for five ones.

6. One. Philosophy. (in Neoplatonism ) the ultimate reality, seen as a central source of being by whose emanations all entities, spiritual and corporeal, have their existence, the corporeal ones containing the fewest of the emanations.

pronoun

1. a person or thing of a number or kind indicated or understood:

   one of the Elizabethan poets.

2. (in certain pronominal combinations) a person unless definitely specified otherwise:

   every one.

3. (with a defining clause or other qualifying words) a person or a personified being or agency: the one I love.

   the evil one;

   the one I love.

4. any person indefinitely; anyone:

   One's score is never as good as one would desire.

5. Chiefly British. (used as a substitute for the pronoun I):

   Mother had been ailing for many months, and one should have realized it.

6. a person of the speaker's kind; such as the speaker's own self:

   to press one's own claims.

7. something or someone of the kind just mentioned: Your teachers this semester seem to be good ones.

   The portraits are fine ones.

   Your teachers this semester seem to be good ones.

8. something available or referred to, especially in the immediate area: The bar is open, so have one on me!

   Here, take one—they're delicious.

   The bar is open, so have one on me!

-one

²

1. a suffix used in the names of ketones and analogous chemical compounds:

   lactone; quinone.

one

¹

/ wʌn /

determiner

1. 1. single; lone; not two or more

      one car

   2. ( as pronoun )

      one at a time

      one is enough for now

   3. ( in combination )

      one-eyed

      one-legged

2. 1. distinct from all others; only; unique

      one girl in a million

   2. ( as pronoun )

      one of a kind

3. 1. a specified (person, item, etc) as distinct from another or others of its kind

      raise one hand and then the other

   2. ( as pronoun )

      which one is correct?

4. a certain, indefinite, or unspecified (time); some

   one day you'll be sorry

5. informal.
   an emphatic word for a 1 an 1

   it was one hell of a fight

6. a certain (person)

   one Miss Jones was named

7. in one or all in one
   combined; united
8. all one
   1. all the same
   2. of no consequence

      it's all one to me

9. at one
   often foll by with in a state of agreement or harmony
10. be made one
    (of a man and a woman) to become married
11. many a one
    many people
12. neither one thing nor the other
    indefinite, undecided, or mixed
13. never a one
    none
14. one and all
    everyone, without exception
15. one by one
    one at a time; individually
16. one or two
    a few
17. one way and another
    on balance
18. off on one informal.
    exhibiting bad temper; ranting
19. one with another
    on average

pronoun

1. an indefinite person regarded as typical of every person

   one can't say any more than that

2. any indefinite person: used as the subject of a sentence to form an alternative grammatical construction to that of the passive voice

   one can catch fine trout in this stream

3. archaic.
   an unspecified person

   one came to him

noun

1. the smallest whole number and the first cardinal number; unity See also number
2. a numeral (1, I, i, etc) representing this number
3. informal.
   a joke or story (esp in the one about )
4. music the numeral 1 used as the lower figure in a time signature to indicate that the beat is measured in semibreves
5. something representing, represented by, or consisting of one unit
6. Also calledone o'clock one hour after noon or midnight
7. a blow or setback (esp in the phrase one in the eye for )
8. the one
   (in Neo-Platonic philosophy) the ultimate being
9. the Holy One or the One above
   God
10. the Evil One
    Satan; the devil

-one

²

suffix forming nouns

1. indicating that a chemical compound is a ketone

   acetone

–one

1. A suffix used to form the names of chemical compounds containing an oxygen atom attached to a carbon atom, such as acetone.

Grammar Note

One as an indefinite pronoun meaning “any person indefinitely, anyone” is more formal than you, which is also used as an indefinite pronoun with the same sense: One (or you ) should avoid misconceptions. One (or you ) can correct this fault in three ways. When the construction requires that the pronoun be repeated, either one or he or he or she is used; he or he or she is the more common in the United States: Wherever one looks, he (or he or she ) finds evidence of pollution. In speech or informal writing, a form of they sometimes occurs: Can one read this without having their emotions stirred? In constructions of the type one of those who (or that or which ), the antecedent of who is considered to be the plural noun or pronoun, correctly followed by a plural verb: He is one of those people who work for the government. Yet the feeling that one is the antecedent is so strong that a singular verb is commonly found in all types of writing: one of those people who works for the government. When one is preceded by only in such a construction, the singular verb is always used: the only one of her sons who visits her in the hospital. The substitution of one for I, a typically British use, is usually regarded as an affectation in the United States. he ¹, they.

Word History and Origins

Origin of one¹

First recorded before 900; Middle English oon, Old English ān; cognate with Dutch een, German ein, Gothic ains, Latin ūnus ( Old Latin oinos ); akin to Greek oínē “ace on a die”

Origin of one²

Perhaps < Greek -ōnē feminine patronymic

Word History and Origins

Origin of one¹

Old English ān, related to Old French ān, ēn, Old High German ein, Old Norse einn, Latin unus, Greek oinē ace

Origin of one²

arbitrarily from Greek -ōnē, feminine patronymic suffix, but perhaps influenced by -one in ozone

Idioms and Phrases

Idioms

1. at one,
   1. in a state of agreement; of one opinion.
   2. united in thought or feeling; attuned.

      He felt at one with his Creator.

2. one and all, everyone:

   They came, one and all, to welcome him home.

3. one by one, singly and successively:

   One by one the children married and moved away.

4. one for the road. road ( def 10 ).

More idioms and phrases containing one

• all in one piece
• all the same (one)
• A-1 (A-one)
• as one
• at one
• at one stroke
• at one time
• at one time or another
• back to the drawing board (square one)
• each and every (last one)
• each other (one another)
• fast one
• for one, 1
• go one better
• hang (one) on
• harp on (one string)
• hole in one
• in one ear and out the other
• in the same (in one) breath
• irons in the fire, more than one
• it takes one to know one
• just one of those things
• look out for (number one)
• more than one way to skin a cat
• not one iota
• number one
• on the one hand
• (one) picture is worth a thousand words
• put all one's eggs in one basket
• quick one
• seen one, seen them all
• six of one, half dozen of the other
• that's one on me
• tie one on
• wear another (more than one) hat
• with one arm tied behind one's back
• with one voice
• words of one syllable

Example Sentences

To develop safer, more effective ionizable lipids, the Penn Engineers employed a unique approach that combines two prevailing methods: medicinal chemistry, which involves slowly and laboriously designing molecules one step at a time, and combinatorial chemistry, which involves generating many different molecules quickly through simple reactions.

From Science Daily

Organisms are constantly taking in an array of sensory information about the environment that is changing from one moment to the next.

From Science Daily

One possibility is the anatomy of the circuit: the connections that form between each neuron and how many connections they make.

From Science Daily

In the case of traffic signal control, each task could be one intersection in a task space that includes all intersections in the city.

From Science Daily

She can train one algorithm for each intersection independently, using only that intersection's data, or train a larger algorithm using data from all intersections and then apply it to each one.

From Science Daily

Related Words

• anyone
• you