Relating to an empire or emperor; having supreme authority or commanding great power and influence.
From Latin 'imperialis' from 'imperium' meaning command or empire, derived from 'imperare' (to command). The root 'imper-' suggests absolute authority, as emperors held imperium - the ultimate power to command.
Imperial measurements like feet and inches persist in some countries partly due to their historical connection to royal authority - literally the 'emperor's measurements.' The Imperial College London still carries this sense of prestigious, authoritative excellence in its name.
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