Definition of group
1
: two or more figures forming a complete unit in a composition
- went there as a group
2 a
: 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
3 a
: 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
