(of an independent person or body) reach an authoritative judgement or settlement.
Mid 16th century: from Latin arbitrat- ‘judged’, from arbitrari, from arbiter ‘judge, supreme ruler’.
“The whole dilemma will need us to arbitrate!”
An antechamber, hall, or lobby next to the outer door of a building.
Early 17th century (denoting the space in front of the main entrance of a classical Roman or Greek building): from French, or from Latin vestibulum ‘entrance court’.