group

1 : two or more figures forming a complete unit in a composition went there as a group

2a : a number of individuals assembled together or having some unifying relationship a study group

b : an assemblage of objects regarded as a unit one of the food groups

c(1) : a military unit consisting of a headquarters and attached battalions

(2) : a unit of the U.S. Air Force higher than a squadron and lower than a wing

3a : an assemblage of related organisms —often used to avoid taxonomic connotations when the kind or degree of relationship is not clearly defined

b(1) : two or more atoms joined together or sometimes a single atom forming part of a molecule especially : functional group a methyl group

(2) : an assemblage of elements forming one of the vertical columns of the periodic table

c : a bed or layer of rocks deposited during an era

4 : a mathematical set that is closed under a binary associative operation, contains an identity element, and has an inverse for every element

Definition of group