n.

1. 群；组；类[C][G]
   There appeared a group of aeroplanes in the sky.

   天空中出现了机群。

2. 集体；团体[C][G]
   He belonged to the left-wing group.

   他属于左翼集团。

3. 流行乐团[C]
4. （英、美的）空军大队[C]

vt.

1. 把……分组（或归类）[（+into）]
   We can group animals into several types.

   我们可以把动物分成几类。

2. 把……聚集

vi.

1. 聚集[（+about/round）]
   The students grouped around the professor.

   学生们聚集在教授周围。

n.

1. a number of people or things located, gathered, or classed together.
2. a number of musicians who play popular music together.
3. Chemistry  a set of elements occupying a column in the periodic table and having broadly similar properties.
4. Chemistry  a combination of atoms having a recognizable identity in a number of compounds.
5. Mathematics  a set of elements, together with an associative binary operation, which contains an inverse for each element and an identity element.
6. a division of an air force, usually consisting of two or more stations.

v.