/ · 1894 Brewer’s · E · Empire of Reason; the Empire of Truth
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etc., i.e. reason or truth as the governing principle. Empire is the Latin imperʹium, a jurisdiction, and an emperor is one who holds command.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.