To vanish means to disappear suddenly and completely, often in a way that seems mysterious or impossible to explain. When a magician makes a rabbit vanish from a hat, it seems to disappear into thin air. When your homework vanishes from your backpack, you search everywhere but can't find any trace of it.

The word emphasizes quickness or mystery in the disappearance. A melting ice cube doesn't vanish, it gradually turns to water. But fog can vanish when the sun suddenly breaks through, there one moment and gone the next.

You might say that your nervousness vanished when you realized the test was easier than expected, or that your little brother vanished into the crowd at a busy fair. Scientists studying endangered species worry that certain animals could vanish forever if their habitats aren't protected.

Whether it's steam vanishing into the air, a shy cat vanishing under the bed, or the last cookie mysteriously vanishing from the jar, the word captures that sense of something being there one moment and completely gone the next.