Meaning: Universal life force or energy.
Qi is a metaphysical belief. It is meant to be the life force of the universe which permeates all matter. It is also believed to be the source of life. It has its roots in vitalism; the belief that life, the soul, or the spirit is separate from the physical form.
Qi is about balance and harmony of the opposing forces of yin and yang.
It is harmonising the flow of Qi, by balancing yin and yang, that is the theoretical basis of healing used in acupuncture in the body, and in creating a positive environment by Feng Shui practitioners.
The ideas of vitalism are also embraced by New Age thinkers. Instead of yin and yang, harmony is said to be achieved by balancing energies.
Qi has never been measured or shown to exist.