Tao

In the East, there is the idea of "Tao" which is sometimes referred to as "the way" or "the way of Tao".  Tao refers to "all there is".  Split in two, it formed Yin & Yang.  These two opposites exist in relationship to one another. Oppositions dance naturally with give and take, equalizing constantly.  Too much of one aspect will result in necessary re-balancing.

According to something I read recently, Western languages lack a single, designated term for the concept of oneness and the nature of opposition contained within. 

Fortunately, Tao Te Ching by Lao Tzu is available in many English translations.  The World is smaller, the information vast, teachers are teaching.  We'll just have to rely on more than a single word for the more important distilled experience.