1 [U] the state of being able to see, hear, feel, etc 清醒；有知觉；有感觉: As he fell, he hit his head and lost consciousness. 他跌倒时撞着头部，失去了知觉。She regained consciousness after two weeks in a coma. 她昏迷了两个星期才恢复知觉。

2 [U] [sing] consciousness (of sth) the state of realizing or noticing that sth exists 察觉；意识到: There is (a) growing consciousness of the need to save energy. 人们越来越意识到必须节约能源。