Let's take a look at a couple definitions of the term "soil health." First defining the words separately.
“The unconsolidated mineral or organic material on the immediate surface of the earth that serves as a natural medium for the growth of land plants.” (Soil Science Society of America (SSSA))
"The condition of being sound in body, mind, or spirit.” (Merriam-Webster) This may be adapted to for soil to " “the condition of being in sound physical, chemical, and biological condition."
“The state of the soil being in sound physical, chemical, and biological condition, having the capability to sustain the growth and development of land plants."
Definition by functions:
"The capacity of soil to function as a vital living system, within ecosystem and land-use boundaries, to sustain plant and animal productivity, maintain or enhance water and air quality, and promote plant and animal health” (Doran and Zeiss, 2000).