1878, in the meaning defined above
borrowed from New Latin vallātus, going back to Latin, past participle of vallāre "to surround with a rampart, ring round," derivative of vallum "palisade of stakes, rampart," — more at wall entry 1
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“Vallate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vallate. Accessed 27 Nov. 2021.
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