How can we define complexity?

[leo-rcc]

From wiki:

In general usage, complexity tends to be used to characterize something with many parts in intricate arrangement. In science there are at this time a number of approaches to characterizing complexity, many of which are reflected in this article. Seth Lloyd of M.I.T. writes that he once gave a presentation which set out 32 definitions of complexity.

So I would summarize that defining complexity is something to be done on a case to case basis and can't be generalized.