1. (noun) the cardinal number that is the sum of three and one

• 4
• foursome
• iv
• little joe
• quadruplet
• quartet
• quatern
• quaternary
• quaternion
• quaternity
• tetrad

2. (noun) a playing card or domino or die whose upward face shows four pips

• four-spot

3. (adjective) being one more than three

• 4
• iv

1. (adjective) being one more than three

• cardinal

1. (noun) the cardinal number that is the sum of three and one

• digit
• figure

2. (noun) a playing card or domino or die whose upward face shows four pips

• dice
• die
• domino
• spot