treated as sing. or pl.
1- a number of people or things that are located close together or are considered or classed together组; 群; 类：
these bodies fall into four distinct groups.
这些物体分属四个截然不同的种类。
1.1
- a number of people that work together or share certain beliefs集体, 团体：
I now belong to my local drama group.
我现在是本地的戏剧小组成员。
1.2
- a commercial organization consisting of several companies under common ownership（由若干公司组成的）集团, 集团公司。
1.3
- a number of musicians who play popular music together流行乐团。
1.4
- Military a division of an air force, usually consisting of two or more stations【军】空军大队（通常由两个或两个以上的基地组成）。
1.5
- Art two or more figures or objects forming a design【艺术】群像（由两个或两个以上的人或物体形象组成的群体设计）。
1.6
- Linguistics (in systemic grammar) a level of structure between clause and word, broadly corresponding to phrase in other grammars【语言学】（系统语法中的）词组（与其他语法中的phrase大致对等）。
1.7
- Chemistry a set of elements occupying a column in the periodic table and having broadly similar properties arising from their similar electronic structure【化】（元素周期表中的）族。
1.8
- Chemistry a combination of atoms having a recognizable identity in a number of compounds【化】原子团。
1.9
- Mathematics a set of elements, together with an associative binary operation, which contains an inverse for each element and an identity element【数】群。
with obj. and adverbial(常作be grouped)
1- put together or place in a group or groups把…聚集到一起; 使形成（一个或多个）组（群、团体等）：
three wooden chairs were grouped around a dining table.
餐桌周围放了三把木椅。
1.1
- put into categories; classify将…分类：
we group them into species merely as a convenience.
我们将其分类只是为了方便。
1.2
- no obj., with adverbial form a group or groups形成组（群、团体等）：
many growers began to group together to form cooperatives.
很多种植者开始联合起来组成合作社。
词源
late 17th cent.: from French groupe, from Italian gruppo, of Germanic origin; related to CROP.