Real Dictionary

AIDS
uncountable noun: AIDS is a disease which destroys the natural system of protection that the body has against other diseases. AIDS is an abbreviation for 'acquired immune deficiency syndrome'.

AIDS in American English
a condition in which an acquired deficiency of certain leukocytes, esp. T cells, results in a variety of infections, some forms of cancer, and the degeneration of the nervous system: caused by an HIV virus which infects T cells and is transmitted via body
noun: a disease of the immune system characterized by increased susceptibility to opportunistic infections, as pneumocystis carinii pneumonia and candidiasis, to certain cancers, as Kaposi's sarcoma, and to neurological disorders: caused by a retrovirus and tra

aids in American English (in manège)
the means by which a rider communicates with and controls a horse, as the hands, legs, voice, and shifts in weight

AIDS in British English
noun acronym for: acquired immune (or immuno-) deficiency syndrome: a condition, caused by a virus, in which certain white blood cells (lymphocytes) are destroyed, resulting in loss of the body's ability to protect itself against disease. AIDS is transmitted by sexual inte