Not inherited, or present at birth (congenital), but developing after birth. For example, AIDS is an acquired, not an inherited, form of immune deficiency.

c. 1600, "gained by effort," past participle adjective from acquire. Of diseases, "occurring after birth, thus not dependent on heredity," 1842 (opposed to congenital). Acquired ta [..]

adjective. Expressing a reply, form of conduct, concept, or data that has been discovered or even created based on experiences instead of being natural.

  Developed in response to the environment, not inherited, such as a character trait (acquired characteristic) resulting from environmental effect(s). cf

(adj) gotten through environmental forces

Conditions that are not inborn and that develop during the animal's life.

A disease or condition/characteristic that is not congenital but develops after birth; common acquired conditions include stroke/CVA, brain injury, brain tumour, dementia, motor neurone disease (MND), [..]

In medicine, the word acquired means new or added. New in the sense that it is not genetic (inherited) and added in the sense that is was not congenital (present at birth) but came along later. For example, AIDS is an acquired, not a genetic form of immune deficiency. (12 Dec 1998)

acquire