Medical Definition of Human immunodeficiency virus. Human immunodeficiency virus: HIV, the cause of AIDS. HIV has also previously been called the human lymphotropic virus type III, the lymphadenopathy-associated virus and the lymphadenopathy virus. No matter what name is applied, it is a retrovirus. (A retrovirus has an RNA genome and a reverse transcriptase enzyme.
Definition of custody for English Language Learners. 1  law : the legal right to take care of a child (such as a child whose parents are divorced) : 2  the state of being kept in a prison or jail. : 3  the act of protecting or taking care of something.
At some point a judge may decide the terms of legal and physical custody. Legal custody means the legal right and responsibility to raise a minor child and to make decisions on her or his behalf. Joint, split, and shared legal custody require both parentsâ approval for all major decisions. Physical custody means possession and it defines the physical location of the child.