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A hominid 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, including only humans and their closest relatives. The meaning of the taxon changed gradually, leading to the modern meaning of "hominid" in which it includes all great apes.

The primatological term is easily confused with a number of very similar words:

• A hominoid is a member of the superfamily Hominoidea: extant members are the lesser apes (gibbons) and great apes.
• A hominid is a member of the family Hominidae: all of the great apes.
• A hominine is a member of the subfamily Homininae: gorillas, chimpanzees, humans (excludes orangutans).
• A hominin is a member of the tribe Hominini: chimpanzees and humans.
• A hominan is a member of the sub-tribe Hominina: modern humans and their extinct relatives.
• A human is a member of Homo sapiens and is sometimes also used to refer to any extinct member of the genus Homo or members from other hominan genera.
• A humanoid is a vaguely human-shaped entity; the term is typically used in fiction.

Certain morphological characteristics are still used conventionally to support the idea that hominid should only denote humans and human ancestors, namely bipedalism and large brains. These points of departure between human beings and the other great apes are important, but according to geneticically based taxonomic classification, are not enough to divide us into separate families. Genetics, rather than morphology, is now generally accepted as the critical test of relatedness, and the terms hominid and "great ape" are now effectively coterminous. Anthropologists use the term to mean humans and their direct and near-direct bipedal ancestors.

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Extant family	Hylobatidae · Hominidae
Extant genera	Hylobates · Hoolock · Nomascus · Symphalangus · Pongo · Gorilla · Pan · Homo
Extant species	Lar Gibbon · Agile Gibbon · Müller's Bornean Gibbon · Silvery Gibbon · Pileated Gibbon · Kloss's Gibbon · Western Hoolock Gibbon · Eastern Hoolock Gibbon · Siamang · Black Crested Gibbon · Eastern Black Crested Gibbon · White-cheeked Crested Gibbon · Yellow-cheeked Crested Gibbon · Bornean Orangutan · Sumatran Orangutan · Western Gorilla · Eastern Gorilla · Common Chimpanzee · Bonobo · Human
Ape study	Aquatic ape hypothesis · Ape language · Ape Trust · Dian Fossey · Birutė Galdikas · Jane Goodall · Chimpanzee genome project · Human genome project
Legal status	Personhood · Research ban · Declaration · Kinshasa Declaration · Great Ape Project · Survival Project
See also...	Bushmeat · Ape extinction · List of notable apes · List of fictional apes · Human evolution · Mythic Humanoids · Hominid · Planet of the Apes