a. The branch of science concerned with the use, transfer, loss, etc., of energy in physical, chemical, and biological systems and processes.
b. With plural concord. The properties of energy use, transfer, loss, etc., within a system or process.
2. orig. and chiefly Physics. The doctrine or theory that changes in energy form the basis of all physical phenomena, and that energy is the fundamental constituent of the universe; = energeticism n. 2. Now hist.
3. In various types of holistic medicine, esp. acupuncture: the flow of energy in the body; any of various therapies based on achieving a balanced flow of energy in the body, frequently employing techniques such as massage, deep breathing, and talking. Cf. bioenergetics n. 2, energy n. 8.
► indicates date of composition for this text (as opposed to date of documentary evidence). More