The difference between One and They
When used as pronouns, one means one thing (among a group of others), whereas they means a group of people, animals, plants or objects previously mentioned.
One is also noun with the meaning: the digit or figure 1.
One is also numeral with the meaning: the represented by the.
One is also verb with the meaning: to cause to become one.
One is also adjective with the meaning: of a period of time, being particular.
They is also determiner with the meaning: the, those.
check bellow for the other definitions of One and They
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One as a pronoun (impersonal pronoun, indefinite):
One thing (among a group of others); one member of a group.
Examples:
"The big one looks good.  I want the green one.  nowrap A good driver is one who drives carefully."
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One as a pronoun (impersonal pronoun, sometimes with "the"):
The first mentioned of two things or people, as opposed to the other.
Examples:
"She offered him an apple and an orange; he took one and left the other."
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One as a pronoun (indefinite personal pronoun):
Any person (applying to people in general).
Examples:
"One’s guilt may trouble one, but it is best not to let oneself be troubled by things which cannot nowrap be changed.  nowrap One shouldn’t be too quick to judge."
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One as a pronoun (pronoun):
Any person, entity or thing.
Examples:
"driver", noun: one who drives."
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One as a noun:
The digit or figure 1.
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One as a noun (mathematics):
The neutral element with respect to multiplication in a ring.
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One as a noun (US):
A one-dollar bill.
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One as a noun (cricket):
One run scored by hitting the ball and running between the wickets; a single.
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One as a noun:
A joke or amusing anecdote.
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One as a noun (colloquial):
A particularly special or compatible person or thing.
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One as a noun (Internet slang, leet, sarcastic):
Used instead of ! to amplify an exclamation, parodying unskilled typists who forget to press the shift key while typing exclamation points, thus typing "1".
Examples:
"A: ''SUM1 Hl3p ME im alwyz L0ziN!!?!"
"B: ''y d0nt u just g0 away l0zer!!1!!one!!one!!eleven!!1!"
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One as an adjective:
Of a period of time, being particular.
Examples:
"'One day the prince set forth to kill the dragon that had brought terror to his father’s kingdom for centuries."
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One as an adjective:
Being a single, unspecified thing; a; any.
Examples:
"My aunt used to say, "One day is just like the other."
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One as an adjective:
Sole, only.
Examples:
"He is the one man who can help you."
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One as an adjective:
Whole, entire.
Examples:
"Body and soul are not separate; they are one."
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One as an adjective:
In agreement.
Examples:
"We are one on the importance of learning."
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One as an adjective:
The same.
Examples:
"The two types look very different, but are one species."
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One as an adjective:
Being a preeminent example.
Examples:
"He is one hell of a guy."
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One as an adjective:
Being an unknown person with the specified name; see also "a certain".
Examples:
"The town records from 1843 showed the overnight incarceration of one “A. Lincoln”."
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One as a verb (obsolete, transitive):
To cause to become one; to gather into a single whole; to unite.
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They as a pronoun (the third-person plural):
A group of people, animals, plants or objects previously mentioned.
Examples:
"Fred and Jane? They just arrived.'' ''Dogs may bark if they want to be fed.'' ''Plants wilt if they are not watered."
"I have a car and a truck, but they are both broken."
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They as a pronoun (the third-person singular, sometimes proscribed):
A single person, previously mentioned, especially if of unknown or non-binary gender, but not if previously named and identified as male or female.
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They as a pronoun (indefinite pronoun, vague meaning):
People; some people; people in general; someone, excluding the speaker.
Examples:
"They say it’s a good place to live."
"They didn’t have computers in the old days."
"They should do something about this."
"They have a lot of snow in winter."
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They as a pronoun (US, _, dialectal):
There .