Definition of: digestion

(di·jes′chən, dī-) noun
1. Physiol. a The process of dissolving and chemically changing food in the stomach, so that it can be assimilated by the blood and furnish nutriment to the body. b The power to digest; the digestive functions.
2. Mental reception and assimilation.
3. Exposure of a substance to heat and moisture preparatory to a chemical or other operation; solution.
4. Any absorption and assimilation, as of carbon dioxide, or of insects and other animal matter, by plants.