What is the definition of adult?

Beginners

The word 'adult' refers to a person who is fully grown and has reached the age of maturity, which is typically considered to be 18 years old or older. It can also refer to something that is intended for or suitable for grown-up individuals.

Intermediate

The word "adult" as an intermediate level definition means a person who is fully grown or developed and has reached the age of maturity. In legal terms, it usually refers to individuals who are 18 years of age or older. Adults are expected to be responsible for their actions and decisions, and they are often considered to be more experienced and knowledgeable than children and teenagers.

Advanced

Advanced learners can understand the definition of 'adult' in more complex terms, such as a person who has reached or surpassed the age of legal majority; a person who has reached maturity, both physically and emotionally; also, a person who acts maturely and responsibly. Additionally, 'adult' can be used as an adjective to describe things that are intended for or suitable for adults.