Definitions of sworn in
to have taken an oath (=a promise that that a person will tell the truth) as a witness (=someone who tells a court what they know about something that has happened) in a court
Mrs Sheridan denies making false statements on 31 July 2006, after being sworn in as a witness in the civil jury trial.
to have taken an oath (=a promise to act a certain way in the future) to act in an official capacity
One of his first acts after being sworn in as prime minister was to approve the formation of a new anti-corruption task force.