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English definition of “that”

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that

determiner uk   /ðæt/ ( plural those ) us  
A1 used to refer to a person, object, idea, etc. that is separated from the speaker by space or time: I've never liked that cousin of hers. Who's that? Is that the girl you told me about? How much are those shoes? formal His handwriting is like that (= the writing) of a much younger child.A1 used to refer to something that has been mentioned or was involved earlier, or to something that is already known about: Where's that pen (= the one I was using earlier) gone? She lives in that house by the bus station (= you know which one I mean).
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that

conjunction uk   strong /ðæt/ weak /ðət/ us  
A2 used to introduce a clause that reports something or gives further information, although it can often be left out: She said (that) she'd collect it for me after work. Is it true (that) she's gone back to teaching? We'll be there at about 7.30, provided/providing (that) there's a suitable train. It was so dark (that) I couldn't see anything.
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Grammar

that

pronoun uk   strong /ðæt/ weak /ðət/ ( plural those) us  

that pronoun (USED TO REFER)

B1 used as the subject or object of a verb to show which person or thing you are referring to, or to add information about a person or thing just mentioned. It is used for both people and things. It can often be left out: I can't find the books (that) I got from the library. Is this the train that stops at Cambridge? Have you been to the restaurant that's just opened in town?
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that pronoun (SOMETHING NOT HERE)

A2 used to make a connection with an earlier statement: My usual train was cancelled. That's why I'm so late. Lucy has just ruined her new dress. That's children for you (= such behaviour is typical of children).B2 used to express a reaction to something: I didn't know she'd been so ill. That's terrible. Turn the engine on, then put the car in gear. That's right (= you are doing it correctly). Smile for the camera. That's more like it (= that smile is better than before).
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  • Charles had told her off. That's why she was so upset.
  • "Jim didn't even turn up." "That's Jim for you."
Grammar

that

(Definition of that from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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