An eruption happens when something suddenly bursts or comes out.
When we talk about volcanoes, an eruption means a big explosion of lava and ash. But eruptions can also happen in other situations - like when a volcano "erupts" on to social media because it's really popular! In science, an erupting star means that the outer layers are being released into space.
To eject something violently (such as lava or water, as from a volcano or geyser).
Example: The volcano erupted, spewing lava across a wide area.
