Eleventh means coming right after tenth in order or position. If you're the eleventh person in line for the water fountain, ten people go before you. If your birthday falls on the eleventh day of the month, it comes after the tenth and before the twelfth.

You'll also see eleventh written as 11th. In fractions, an eleventh is one part when something gets divided into eleven equal pieces. If you split a pizza into eleven slices (unusual, but possible!), each slice represents one eleventh of the whole pizza.

The phrase eleventh hour means the very last moment before it's too late, like finishing your science project at the eleventh hour right before it's due. While eleventh-hour solutions can work out, they're usually more stressful than getting things done earlier.