Definition of "chi"

Early Taoist philosophers and alchemists regarded ch'i as a vital force inhering in the breath and bodily fluids and developed techniques to alter and control the movement of ch'i within the body; their aim was to achieve physical longevity and spiritual power.]

, 15th edition, volume 3, page 186, column 3

He took several deep breaths, finding his chi as Butler had taught him.

2001, Eoin Colfer, Artemis Fowl, Viking Press, page 196

At the greenmarket, it’s still mostly potatoes and apples. There are no tender greens, fava beans, peas, asparagus, artichokes, sorrel, rhubarb or early strawberries.Those harbingers of the season are said to be full of chi, or qi, the Chinese word for life force. We’re craving them as we’re craving lighter, brighter-tasting meals, food that is greener and fresher.

2013 April 2, David Tanis, “Hurry Up, Spring”, in The New York Times‎, archived from the original on 02 April 2013, Dining & Wine‎

According to traditional Chinese medicine, blood carries chi, your “life force,” which fuels all the functions of the body. When you lose blood, you lose chi, and this causes your body to go into a state of yin (cold). When yin (cold) and yang (hot) are out of balance, your body will suffer physical disorders.

2017 January 8, Leslie Hsu Oh, “I tried the Chinese practice of ‘sitting the month’ after childbirth”, in The Washington Post‎, archived from the original on 08 January 2017, Health & Science‎