adult

/əˈdʌlt/
noun
  1. A person who is fully grown or developed, typically over the age of 18 or 21.
    • As an adult, she learned to manage her own finances.
    • Only adults are allowed to vote in national elections.
    • The museum offers a discount for students and a full price for adults.
Antonyms
adjective
  1. Fully grown or developed; characteristic of an adult.
    • He took on adult responsibilities when he started working full-time.
    • The adult birds have brighter feathers than the young ones.
    • The course is designed for adult learners who want to improve their skills.
  2. Suitable for or involving adults, often referring to mature content.
    • Some books are labeled as adult fiction because of their complex topics.
    • The comedy show had adult humor that was not appropriate for children.
    • The movie is rated R for adult themes and language.
Synonyms
What does "adult" mean? | whatsthatwordmean | whatsthatwordmean