This is the 1935th most frequent Chinese word.
成人
"Adult" or "to become an adult."
In this sentence, '成人' is used as a noun meaning 'adult', referring to a mature individual.
他终于成为了一个自信的成人。
He has finally become a confident adult.
Here, '成人' functions as a verb meaning 'to be realized or become complete,' conveying accomplishment or fulfillment.
通过努力，她的愿望终于成人了。
Through effort, her wish has finally been realized.
In this context, '成人' acts as an adjective meaning 'adult', describing courses intended for adult learners.