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1.
Used to describe the final moments of a given event, or situation where change is still a possibility.

Right before a deadline.
I procrastinated all night and now, in the 11th hour, I need to work my ass off to finish this report moments before it is due.
by FlowersInMidgar2 June 10, 2008
 
2.
The last possible moment before fate is decided.

In countries that watch a lot of soccer, it's more common to say 90th minute.
At the 11th hour, the judge pardoned the death-row inmate.
by EAS January 13, 2013
 
3.
Used to describe the final moments of a given event, or situation where change is still a possibility.

Right before a deadline.
I procrastinated all night and now, in the 11th hour, I need to work my ass off to finish this report moments before it is due.
by FlowersInMidgar2 June 10, 2008