Taoism
Dechar (2005: p. 5–6) speculates that the terms "Tao" and "Darma" are etymologically related by iby the etymon "da":
"The word Tao has no exact English translation, but it relates most closely to the Western idea of wholeness, to the unknowable unity of the divine. When used by the Taoist philosophers, Tao became the Way, the path or cosmic law that directs the unfolding of every aspect of the niverse. So Tao is the wisdom of the divine made manifest in nature and in my individual life. The Chinese word Tao has an etymological relationship to the Sanskrit root sound "da", which means "to divide something whole into parts". The ancient Sanskrit word dharma is also related to this root. In the Buddhist tradition, dharma means "that which is to be held fast, kept, an ordinance or law...the absolute, the real." So, both dharma and Tao refer to the way that the One, the unfathomable unity of the divine, divides into parts and manifests in the world of form."
(However, Chinese and Sanskrit are not generally regarded as related languages). Taoism's wu wei (Chinese wu, not; wei, doing) is a term with various translations (e.g. inaction, non-action, nothing doing, without ado) and interpretations designed to distinguish it from passivity. From a nondual perspective, it refers to activity that does not imply an "I". The concept of Yin and Yang, often mistakenly conceived of as a symbol of dualism, is actually meant to convey the notion that all apparent opposites are complementary parts of a non-dual whole. The Tao Te Ching has been seen as a nondualist text; from that perspective, the term "Tao" could be interpreted as a name for the Ultimate Reality (which, as the Tao Te Ching itself notes, is not the reality itself).
Read more about this topic: Nondualism