Simple past tense and past participle of demarcate.(verb)
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Use "demarcated" in a sentence
"The chamber itself is then quite long, and demarcated from the nasal passage by a distinct medially projecting vertical ridge."
"And here one can hardly forbear comparing the magnificently thorough manner in which this frontier was fixed, with the shoddy, confused method in which the Perso-Beluch frontier was "demarcated" -- if the word can be used in this case -- by Sir Thomas Holdich at the same epoch."
"A nation-state wants concrete things such as demarcated borders, markets, access to natural resources, security, influence, and, of course, stability – all things that could be negotiated with other nation-states."