Top Definition
To unknowingly invent something which already exists.

Named after mathematician Gottfried Wilhelm Leibniz, who thought his fancy maths were something new, but in reality they had already been found 8 years earlier by Isaac Newton.
You know that dissertation I was working on lately? Well, turns out I pulled a Leibniz: the whole thing was already discovered centuries ago by some German scientist.
by Fenhl December 23, 2013
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