noun
the state or condition of being an adult; the period of time in a person's life when they are fully developed physically and mentally
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Adulthood is typically defined as the period of time when a person reaches maturity and takes on adult responsibilities.
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Once you hit adulthood, you'll have to start paying your own bills and taking care of yourself.
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I can't wait to be done with school and finally enter the world of adulthood.
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Stepping into adulthood is like entering a whole new chapter of life, full of challenges and opportunities.