a priori, a posteriori - explain plz

[Black Sheep]

Yeahi havent looked it up too much-
but i have some difficulty understanding the magnitutde and depth of them, especially the 1st.
I.e, what i learn from studying books what kind of knowledge is it?
The stuff my parents taught me?

And under which conditions of knowledge acquirement do i receive knowledge a posteriori?

-.-

[Dooga Aetrus Blackrazor]

A posteriori is knowledge you gain from personal experience. Knowing that some birds can fly is an example of a posteriori knowledge.

A priori knowledge is something you can know without personal experience. For example, "All bachelors are unmarried." It's true by definition.

[Rosa Lichtenstein]

http://en.wikipedia.org/wiki/A_priori_and_a_posteriori_(philosophy)