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a fully grown person who is legally responsible for their actions synonym grown-up2 （法律上指能为自己的行为负责的）成年人
Extra ExamplesTopics Life stagesa1
Children must be accompanied by an adult. 儿童必须要有大人陪同。 I simply can't believe that responsible adults allowed a child to wander the streets. 我简直不相信任何有责任感的成年人会让一个孩子在街上游荡。 Why can't you two act like civilized adults? 你们俩为什么就不能像有教养的成年人那样行事呢？ The obesity rate among adults has actually increased. 成年人的肥胖率实际上有所上升。
Oxford Collocations Dictionaryadjective
The number of single adult households has doubled in the past 30 years. 过去 30 年中，单身成年人家庭的数量翻了一番。 This book will definitely appeal to teenagers and young adults. 这本书肯定会吸引青少年。 What consenting adults do in private is their own business. 到了法定性成熟年龄的成年人私下里做什么是他们自己的事。
a fully grown animal 成年动物
Word Originmid 16th cent.: from Latin adultus, past participle of adolescere ‘grow to maturity’, from ad- ‘to’ + alescere ‘grow, grow up’, from alere ‘nourish’.