Learner's definition of NEVER
1 : not ever : not at any time
I will never shop at that store again.
I have never seen that happen before.
That man has never heard of you.
We will never forget what we saw.
You never know what you'll find at a flea market.
I never meant to hurt you.
She never really said that.
There is never enough time to finish our work.
Never in my whole life have I been so offended!
A resume without a cover letter will never do. [=will never be considered acceptable]
Never again will I buy a car from that dealer. = I will never again buy a car from that dealer.
I gave him my business for years and never for one moment did I suspect that he was a criminal.
2 a — used to express surprise, doubt, or disbelief
b — used to say that you did not do something
“He's won the lottery.” “Never!”
“They're getting married.” “Well, I never! [=I am very surprised or shocked to hear that they're getting married]”
— used to tell someone not to worry or be afraid
never mind, never you mind
never say never
— used to say that you should not say that you will never do something because you might change your mind later
never so much as
— used to say that someone did not do something that was expected or should have been done