The number equal to 4; two plus two.

• The value after three and before five.
• Describing a set or group with four elements.

The digit or figure 4; an instance of it.

• Four o'clock.
• A person aged four years.
• Cricket: a shot that scores four runs (boundary).
• Rowing: a boat for four rowers, or its crew.
• Basketball: the power forward position, the four.