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English definition of “this”

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this

determiner, pronoun uk   /ðɪs/ ( plural these ) us  
A1 used for a person, object, idea, etc. to show which one is referred to: Can you sign this form here for me? These books are too heavy for me to carry. informal We met this girl (= the girl I am going to tell you about) in the hotel. This is the one I want. What's this? Is this what you're looking for? What's this I hear about your moving to Scotland?this is ... used when you introduce someone to someone else: Harry, this is Joan.by this time ( also before this) already: I thought you'd have finished by this time.
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this

adverb uk   /ðɪs/ us  
C1 as much as shown or to a particular degree: It was only about this high off the ground. She has never been this late for school before.
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(Definition of this from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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