class/ klɒːs /

1.noun [c] [Education] 
(group of pupils) 班级

2.noun
(lesson) 课

3.noun [c/u] 
(social) 阶级

4.noun [c] 
(type,group) 种类

We can identify several classes of fern.
我们可以识别几种蕨类植物。
5.noun [u] 
(sophistication) 风度

His performance showed enormous class.
他的表现显示出极好的风度。
6.cpd [+structure] [ conflict] [ struggle] 
阶级

7.vt.
to class sb/sth as (categorize) 将某人/某物分类为

At nineteen you're still classed as a teenager.
即使十九岁,你仍被定为十几岁的青少年。
in class
 [教育] 上课时
to be in a class of one's own
独一无二