A homini is any member of the biological family Hominidae (the "great apes"), including the extinct and extant humans, chimpanzees, gorillas, and orangutans. This classification has been revised several times in the last few decades. These various revisions have led to a varied use of the word "hominid": the original meaning of Hominidae referred only to the modern meaning of Hominina, i.e. only humans and their closest relatives. The meaning of the taxon changed gradually, leading to the modern meaning of "hominid," which includes all great apes.