A mission is a specific task or goal that someone feels called to accomplish, often something meaningful or important. When astronauts travel to the International Space Station, they're on a space mission with clear objectives: conduct experiments, repair equipment, gather data. When a rescue team searches for lost hikers, that's their mission until everyone is found safely.

The word carries a sense of purpose and responsibility. A mission involves active commitment and dedication: it's something you're working toward with focus and determination. A scientist might describe her life's mission as finding a cure for a disease. A teacher might see his mission as helping every student discover their potential.

In everyday life, parents might send a child on a simple mission: “Your mission is to take this note to the office and come straight back.” During group projects, teams often define their mission so everyone understands what they're trying to achieve together.

The word can also mean an organization that does charitable or religious work, like a medical mission that provides healthcare in remote areas.

When someone says they're “on a mission,” they mean they're determined and focused and not easily distracted from what they're trying to accomplish.