Definition of Ingestion

Babylon English Dictionary
act of taking into the body, act of taking in via the mouth, consumption (i.e. food)
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Ingestion Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(n.)
The act of taking or putting into the stomach; as, the ingestion of milk or other food.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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ingestion
inghalla \in*ghal"la\ (?), n. (zo?l.) the reedbuck of south africa. [written also ingali.]

WordNet 2.0

Noun
1. the process of taking food into the body through the mouth (as by eating)
(synonym) consumption, intake, uptake
(hypernym) bodily process, body process, bodily function, activity
(hyponym) eating, feeding
(derivation) consume, ingest, take in, take, have
Ingestion Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
Ingestion is 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].

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Ingestion Definition from Society & Culture Dictionaries & Glossaries
Environmental Engineering (English ver.)
 Type of exposure through the mouth.
Ingestion Definition from Medicine Dictionaries & Glossaries
NCI Dictionary of Cancer Terms
Taking into the body by mouth.
A Service of the National Cancer Institute.
CDC Radiological Terms
 1) the act of swallowing; 2) in the case of radionuclides or chemicals, swallowing radionuclides or chemicals by eating or drinking.
  
Source: Centers for Disease Control and Prevention (CDC) ( About )
Hepatitis Central (TM) Liver Disease Medical Glossary
To consume orally