Vital force of Chinese medicine (3)

I believe the answer is:

chi

'vital force of chinese medicine' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for chi that I've seen before include "Mental projection" , "Classical character" , "Greek letter; force in Chinese philosophy" , "Greek letter; Chinese life force" , "One character abroad" .)

I've seen this clue in the Universal and The Wall Street Journal.

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