Definition of groups:
(n) :
A number of things or persons being in some relation to one another.
(n) :
A (usually small) group of people who perform music together.
(v) :
(transitive) To put together to form a group.
(v) :
(intransitive) To come together to form a group.
(n) :
(sociology) A subset of a culture or of a society.
(n) :
(computing) A number of users with the same rights with respect to accession, modification, and execution of files, computers and peripherals.