what is stale share?

[bitminer]

What does exactly 'stale share' mean?
Is it possible somehow to count stale shares if I’m mining solo?

[brunoshady]

I believe that stale share is a share that you submitted and its no longer valid...


I GUESS that you cant make a stale share mining solo, because your will try calculate the whole block by yourself, so only you will send shares...



but Im might be wrong

[bitminer]

But why would be a share no longer valid? 
Was the block solved or does anyone else sent it already? Or what?

[Freakin]

But why would be a share no longer valid? 
Was the block solved or does anyone else sent it already? Or what?

pretty sure someone else has already solved it.