Twice means two times, or on two separate occasions. If you practice piano twice a week, you have lessons on two different days. If someone asks you to repeat something and you say it twice, you've said it a total of two times.

The word shows up everywhere in daily life. A recipe might tell you to stir the batter twice. A teacher might remind the class twice about an upcoming test. If your friend calls you twice in one evening, your phone rings two separate times.

Twice can also mean double an amount: if something costs twice as much as before, the price has doubled. If you're twice as tall as your younger sibling, you're exactly double their height. A cake twice the size of a normal cake is two times as big.

People sometimes use twice in expressions like “think twice,” which means to reconsider carefully before making a decision. If someone tells you not to make them ask twice, they want you to respond the first time. The phrase “lightning never strikes twice” (which isn't actually true) means that extremely unlikely events rarely happen twice in the same place.