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English definition of “this”

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this

adjective, pronoun  /ðɪs/ ( plural these  /ðiz/) us  

this adjective, pronoun (THING REFERRED TO)

used for a person, object, or thing to show which one is referred to or has been referred to before: This book is mine – yours is over there. Try on these sunglasses to see how you look in them. If you wear the scarf like this, it will look better. infml So I said to this guy, "Do I know you?" This also refers to something that is nearest to the speaker in time and sometimes in space: I’ve got to see the doctor again this Thursday. By this time tomorrow, I’ll be in Paris.this is People say this is to introduce someone: Harry, this is Joan.this minute ( also this second) This minute or this second means now: It doesn’t have to be done this minute, but it should be done before lunch.

this

adverb [not gradable]  /ðɪs/ us  

this adverb [not gradable] (AS MUCH)

as much as shown, or to a particular degree: Can you jump this high? She’s never been this late before.
(Definition of this from the Cambridge Academic Content Dictionary © Cambridge University Press)
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