The basic unit of the party is the local association.

To make short reports of any action or place, we set the basic unit as one 'fact'.

The basic unit of local government is the town chief.

This basic unit is still in use today with very little change.

A basic unit in book design is the page spread.

The basic unit for society is and always has been the family.

We should not forget that the family, which includes both parents and children, is the most basic economic unit.

Though families provide the basic unit of organization among men, it is necessary to develop beyond them.

Therefore, the basic units of change are groups, not individuals.

I imagine the basic physical unit is the family and the circle of friends.