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1. The consumption of a substance by an organism. In animals, it normally is accomplished by taking in the substance through the mouth into the gastrointestinal tract, such as through eating or drinking. In single-celled organisms, ingestion can take place through taking the substance through the cell membrane. (

2. The action of ingesting, or consuming something orally, whether it be food, drink, medicine, or other substance. It is usually referred to as the first step of digestion. (

3. To take into the body by the mouth for digestion or absorption. (

4. To take in and absorb as food. (

5. The process or act of engulfing particles by cells (e.g. phagocytic cell). (

Word origin: From Latin ingestionem “a pouring in,” noun of action from past participle stem of ingerere.

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