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Definition

this determiner

/ðɪs/ det (plural these)
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.

(Definition of this determiner from the Cambridge Advanced Learner's Dictionary)

The first and last word in dictionaries