a.

1. 比預期早的，過早的
   This disease produces premature aging of the brain.

   這種疾病使大腦過早衰老。

2. 不成熟的，倉促的，草率的
   She was a bit too premature in giving up this job.

   她放棄這份工作似嫌太草率。

   He ventured a premature opinion at the meeting.

   他在會上大膽發表了一個不成熟的意見。

3. 早產的；早產兒的
   Premature babies are kept alive in incubators.

   早產嬰兒放在保溫箱裡保育。

n.

1. 過早發生的事物
2. 早產兒

adj.

1. occurring or done before the proper time.
2. (of a baby) born before the end of the full term of gestation, especially three or more weeks before.