Biologically, an adult is a human being or other organism that has reached sexual maturity. In human context, the term adult additionally has meanings associated with social and legal concepts. In contrast to a "minor", a legal adult is a person who has attained the age of majority and is therefore regarded as independent, self-sufficient, and . Human adulthood encompasses psychological adult development. Definitions of adulthood are often inconsistent and contradictory; a person may be biologically an adult, and have adult behavior but still be treated as a child if they are under the legal age of majority. Conversely, one may legally be an adult but possess none of the maturity and responsibility that may define an adult character.

Adult (stylized as ADULT.) is an American band from Detroit, Michigan, formed in 1998. The band integrates vocals with drum machines, analog synthesizers and electronic/punk elements. While popular in their home city of Detroit, they are also very popular in Germany and the United Kingdom.

Adulthood (rendered as AdULTHOOD) is a 2008 British drama film. It was directed and written by Noel Clarke, who also stars as the protagonist, Sam Peel. Adulthood is a sequel to the 2006 film Kidulthood, which Clarke also wrote, and depicts Peel's experiences after he is released from jail. It grossed £1,203,319 at the UK Box Office during its opening weekend, ranking above The Incredible Hulk, Indiana Jones and the Kingdom of the Crystal Skull and Sex and the City. After starring in the film, Adam Deacon decided to write and star in his own urban film, Anuvahood.