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
pie in the sky
a goal or plan that is too optimistic, a future reward after death
The boy's plans for his summer were pie in the sky. He would never complete them.