The metric system uses the second as a main unit of time.

The main unit was a 2U with separate controls for each effect.

Ten months later, on September 8, 1947, the main educational unit was opened.

While they were at it, some chose to change the main unit as well.

There were two main units created, each with one leader.

This is a list of the main units at the player's command.

Instead, the main unit would be the ground floor with a finished basement.

He was attempting to get on top of the main unit for a better perspective.

The plan and air photograph show that the village consists of two main units.

The hinges were therefore at the front of the main unit, rather than the back.