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What does optimistic mean?

Looking for the meaning or definition of the word optimistic? Here's what it means.

Adjective
  1. Expecting the best in all possible ways.
  2. (computing) Allowing other processes to perform transactions on the same data at the same time, and checking for conflicts only when changes need to be written back.
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Examples
The trial is still in preliminary stages, but the project's scientists are optimistic.
My life began in those optimistic years following the war to end all wars, when good times were to roll forever.
I am optimistic because there is already a brisk commercial activity under free market conditions.
Their interpretation of the attributional capacities of chimpanzees now seems to have been somewhat overly optimistic.
We're a long way from seeing these cuts put into action, but I'm cautiously optimistic.
Old people think the world is going to wrack and ruin, the young are optimistic.

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