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.
Definitions of Custody. Judges can order different custody arrangements. Parents can agree to a custody arrangement and judges. will usually sign the court order for the arrangements as long as they believe the agreement is in the best. interests of the child. The following are descriptions of various custody arrangements. SOLE CUSTODY: There is no legal definition for sole custody.