Tao

1a :  the unconditional and unknowable source and guiding principle of all reality as conceived by Taoistsb :  the process of nature by which all things change and which is to be followed for a life of harmony

2 often not capitalized :  the path of virtuous conduct as conceived by Confucians

3 often not capitalized :  the art or skill of doing something in harmony with the essential nature of the thing the Tao of archery