1a number of people or things that are located, gathered, or classed together:a group of boys approachedthe bulbs should be planted in groups
a number of people that work together or share certain beliefs:I now belong to my local drama group
a commercial organization consisting of several companies under common ownership:the largest newspaper group in the UK
a number of musicians who play popular music together:I’ve always been a fan of the guitarists in the group
Military a division of an air force, usually consisting of two or more stations.
2 Chemistry a set of elements occupying a column in the periodic table and having broadly similar properties arising from their similar electronic structure.
a combination of atoms having a recognizable identity in a number of compounds:a methyl group
3 Mathematics a set of elements, together with an associative binary operation, which contains an inverse for each element and an identity element.
4 Linguistics (in systemic grammar) a level of structure between clause and word, broadly corresponding to phrase in other grammars.
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Universal
put in a group or groups:three chairs were grouped around a table
put into categories; classify:molluscs are grouped into seven different classes
[no object, with adverbial] form a group or groups:growers began to group together to form cooperatives
