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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
 
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
 
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