summon

A summon is an official request or order for someone to come somewhere.

When you hear that someone's been summoned by the police, it means they've received a formal invitation to go to the station and answer some questions. But it can also mean being asked to attend a meeting or court case, like a judge asking a witness to come in and testify. Sometimes people get summoned for jury duty, which means they're chosen at random to help decide on a case.