Meaning of “this” in the English Dictionary

"this" in British English

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thisdeterminer, pronoun

uk /ðɪs/ us /ðɪs/ plural these

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 you 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 be done by this time.

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Idiom(s)

thisadverb

uk /ðɪs/ us /ðɪs/

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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"this" in American English

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thisadjective, pronoun

us /ðɪs/ plural these /ðiz/

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.

thisadverb [ not gradable ]

us /ðɪs/

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)