The WORD Permaculture comes from the COMBINATION of the two words permanent and culture.

Permaculture is a design science which focuses on the synergistic relationships between various aspects of a system, and supports the perpetually increasing progression of that system with the goal of benefiting the earth, people, and the future.

I picture a Permaculture system like a Celtic knot where all the components are connected with relationships to each other such that any lines going out are tied back in.

According to Bill and Becky Williams:

This issue is SOIL