Longman Dictionary of Contemporary English homepage

really

 adverb
     
real‧ly S1 W1
1

very

very [= extremely]:
a really good film
It was really cold last night.
He walks really slowly.
I'm really, really sorry.
2

the real situation

used when you are talking about what actually happened or is true, rather than what people might wrongly think:
Why don't you tell us what really happened?
Oliver's not really her brother.
I never know what he's really thinking.
She seems unfriendly at first, but she's really very nice.
3 spoken

definitely

used to emphasize something you are saying:
We really need that extra money.
I really don't mind.
I'm absolutely fine, Dad - really.
4 spoken

not true

used in questions when you are asking someone if something is true and suggesting that you think it is not true [= honestly]:
Do you really think she's doing this for your benefit?
Do you really expect me to believe that?
5 spoken
a)

really?

used to show that you are surprised by what someone has said:
'He's Canadian.' 'Really?'
b)

really?

used in conversation to show that you are listening to or interested in what the other person is saying:
'We had a great time in Florida.' 'Really? How lovely.'
c) American English used to show that you agree with someone:
'Glen can be such a jerk.' 'Yeah, really!'
d) especially British English used to show that you are angry or disapprove of something:
Really, Larry, you might have told me!
6 spoken

not really

used to say 'no' or 'not' in a less strong way:
'Do you want to come along?' 'Not really.'
I don't really know what he's doing now.
7 spoken

should/ought really

used to say what someone should do, especially when they are probably not going to do it:
You should really go and see a doctor.
8 spoken

really and truly

also really, truly American English used to emphasize a statement or opinion:
He was really and truly a brilliant comedian.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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