The word "egestion" relates to the process of excreting solid waste from the body. Its antonyms are words that describe the absorption or intake of substances. Some antonyms of egestion include ingestion, assimilation, incorporation, and absorption. Ingestion refers to the process of taking in food or drink, while assimilation suggests the incorporation of nutrients into the body. Incorporation describes the act of including something into the body's tissues, and absorption refers to the taking in of substances through a surface or membrane. Antonyms to egestion, therefore, represent the opposite process, highlighting the body's ability to take in matter and use it as nutrients.