n.
1.any number of entities (members) considered as a unit
2.(chemistry) two or more atoms bound together as a single unit and forming part of a molecule
3.a set that is closed, associative, has an identity element and every element has an inverse group v.
1.arrange into a group or groups
2.form a group or group together
Idiom of the Day
play second fiddle to (someone)
to be second in importance to someone
The man has been playing second fiddle to his boss for many years and has finally decided to change jobs.