The modern term "republic", despite its derivation, is not synonymous with the Roman "res publica". Among the several meanings of the term "res publica", it is most often translated "republic" where the Latin expression refers to the Roman state, and its form of government, between the era of the Kings and the era of the Emperors. This Roman Republic would, by a modern understanding of the word, still be defined as a true republic, even if not coinciding entirely. Thus, Enlightenment philosophers saw the Roman Republic as an ideal system because it included features like a systematic separation of powers.