when‧ev‧er S2 W3 /wenˈevə $ -ˈevər/ adverb, conjunction

1. every time that a particular thing happens:
Larry always blames me whenever anything goes wrong.
Whenever I hear that tune, it makes me think of you.

2. at any time:
Come and visit me whenever you want.
a policy of using recycled paper whenever possible

3. spoken used as a reply to say that it does not matter what time something happens:
‘I’ll call you tomorrow or the day after.’ ‘Okay. Whenever.’

[TahlilGaran] Dictionary of Contemporary English ▲

whenever
conjunction
BAD: Whenever you'll hear about this place, you'll want to come back.
GOOD: Whenever you hear about this place, you'll want to come back.

[TahlilGaran] Dictionary of Common Errors ▲

when at or during the time that something happens:
Call me when you get home.
When I got here, the place was empty.
while during the time that something is happening – used to emphasize that something is continuing:
I’ll make the salad while you set the table.
While we were on holiday, our house was burgled.
whenever used in order to emphasize that something always happens when another thing happens:
He visits his mother whenever he can.
You can come and talk to me whenever you have a problem.
by the time used in order to say that one thing has or will have already happened when something else happens:
By the time a child is five, he will have watched hundreds of hours of television.

[TahlilGaran] English Thesaurus ▲

while during the time that you are doing something, or something is happening:
I bought a magazine while I was waiting for the train.
While we were on holiday, my bag was stolen.
meanwhile at the same time as something else is happening:
They’re still working on our bedroom. Meanwhile, we’re sleeping downstairs.
The Russians, meanwhile, declared war on August 8.
in the meantime during the period of time between now and a future event, or between two events in the past:
More aid is expected soon, but in the meantime these people are going hungry.
My new job hadn’t started, so in the meantime I tried to write a book.
whilst British English while. Whilst sounds a little more formal than while:
One American plane was forced to land whilst flying over North Korea.
Whilst all this was going on, the performers were getting ready for the show.
when at or during the time that something happens:
Call me when you get home.
When I got here, the place was empty.
whenever used in order to emphasize that something always happens when another thing happens:
He visits his mother whenever he can.
You can come and talk to me whenever you have a problem.
by the time used in order to say that one thing has or will have already happened when something else happens:
By the time a child is five, he will have watched hundreds of hours of television.

[TahlilGaran] English Thesaurus ▲