The quality or state of being legitimate; authenticity or validity. The legitimacy of the election results was questioned by many observers.
Conformity to the law or to rules. The legitimacy of the new policy was confirmed by the court.
The right and acceptance of an authority, usually a governing law or a regime. The government's legitimacy was challenged by the opposition party.
The status of being born to parents who are legally married to each other; lawfulness of birth. In medieval times, a monarch’s legitimacy often depended on whether he had been born within wedlock.