Definition of: internal

(in·tûr′nəl) adjective
1. Situated in or applicable to the inside; interior: opposed to external.
2. Pertaining to or derived from the inside; based on the thing itself; inherent.
3. Pertaining to the inner self or the mind; subjective.
4. Pertaining to the domestic affairs of a country: opposed to external or foreign.
5. Anat. a Situated relatively nearer to the median plane of the body or farther from the surface. b Supplying the interior of an organ or region. See synonyms under INHERENT.
—noun
1. A remedy to be taken internally.
2. plural The internal bodily organs; entrails.
3. plural The essential qualities of anything. [<LL internalis <internus <in in]