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English definition of “matter”

matter

noun
 
/ˈmætər/
a subject or situation that you need to think about or do something about: Could I talk to you about a personal matter? This is a matter of some importance.
[no plural] In science, matter is the physical substances that exist in the universe.
what’s the matter? A2 used to ask about the reason for a problem: What’s the matter with your leg?
no matter how, what, when, etc. used to say that something cannot be changed: I never manage to lose any weight, no matter how hard I try.
as a matter of fact used to say that something is true, especially when it is surprising: As a matter of fact, I used to live near him.
to make matters worse used to say that something makes a situation more difficult, unpleasant, etc.: To make matters worse, our car broke down!
(Definition of matter noun from the Cambridge Essential Dictionary © Cambridge University Press)
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