The examples:
because of a particular feeling that you have
http://www.ldoceonline.com/dictionary/out_1
They obeyed him out of fear rather than respect.
Just out of curiosity, why did you take that job?
I forgot somehow but: Thanks for any answer(s) in advance.
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Hole One a New Seeout of practiceThe phrase is not an adverb, but an adjective.
Hole One a New See"Optimization was born out of practice and it ends in practice."Optimization is the result of practice. A practice here is a way or method of doing something. We optimize a way of doing something by adjusting the method to make it better. Thus, the end result is a better practice.