The stage of life when a person is fully grown and legally considered responsible; when you're past being a teenager.
From Old French 'adulte,' derived from Latin 'adultus' (grown up, past participle of 'adolescere'). The suffix '-hood' means 'state or condition of.'
Interestingly, the legal definition of adulthood varies wildly by country—some consider 16-year-olds adults, others 18 or 21. So 'adulthood' is simultaneously a biological reality and a legal invention.
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