1. the number 30

1. the numbers from 30 to 39, especially when referring to someone’s age or to a decade

Examples

• There are thirty students in the class.
• She bought thirty apples for the party.
• He’s in his thirties now.
• The temperature reached thirty degrees.
• Count to thirty before you open your eyes.
• My grandmother lived through the thirties.
• Thirty minutes have passed since we started.