unprecedented /ˌʌnˈprɛsəˌdɛntəd/ adjective /ˌʌnˈprɛsəˌdɛntəd/
adjective
Learner's definition of UNPRECEDENTED
: not done or experienced before前所未有的；史无前例的；空前的 -
The team has enjoyed unprecedented success this year.这支球队今年取得了空前的成功。
-
This level of growth is unprecedented.这种增长速度是前所未有的。
-
An unprecedented number of students are taking the class.选修这门课的学生比以前任何时候都多。