Full means containing as much as possible, with no room left for more. When your backpack is full, you can't squeeze in another book. When the movie theater is full, every seat is taken.

The word describes a state of completeness or maximum capacity. A glass full of milk is filled to the brim. A restaurant that's full has no empty tables. Your stomach feels full after a big meal because it can't comfortably hold more food.

Full also means complete or whole. A full moon is when you see the entire circular face of the moon lit up. A full day of activities means your schedule is packed from morning to night. When someone gives their full attention, they're not distracted by anything else.

The word can describe intensity too. Running at full speed means going as fast as you possibly can. Speaking in a full voice means projecting loudly and clearly rather than whispering.

The opposite of full is empty. A full bottle of juice becomes empty after you drink it all. But notice that full isn't always good and empty isn't always bad: sometimes you need an empty page to start writing, or an empty schedule to relax. Full simply describes maximum capacity, whatever that means in context.