Etymology
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adulthood (n.)

1850, from adult (adj.) + -hood. Adultness is attested from 1731.

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Definitions of adulthood

adulthood (n.)
the period of time in your life after your physical growth has stopped and you are fully developed;
Synonyms: maturity
adulthood (n.)
the state (and responsibilities) of a person who has attained maturity;
From wordnet.princeton.edu