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English definition of “this”

this

determiner, pronoun     /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 your moving to Scotland ? by this time (also before this) already: I thought you'd have finished by this time .Before, after and alreadyAfter and behind Grammar:It, this and that in paragraphsWe use it, this and that to introduce further information about a topic already mentioned. However, the words have different uses.Grammar:This, that, these, thoseThis, that, these and those are demonstratives. We use this, that, these and those to point to people and things. This and that are singular. These and those are plural. We use them as determiners and pronouns.Grammar:This, that, these, those as determinersGrammar:This, that, these, those as pronounsGrammar:This and these, that and those: usesGrammar:Substitution with that, thoseIn formal contexts, we can use that and those as substitutes meaning ‘the one(s)’:
(Definition of this determinerpronoun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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