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mark
determine and set official orders
de·mar·cate means: 1. To set the boundaries of; delimit.2. To separate clearly as if by boundaries; distinguish
Based on this definition demarcate is a verb. Senator Edward Kennedy is a person, which is a noun.
Ted Kennedy is not a demarcate. He is a democrat. A member of a political party.
mark out, outline, limit, bound, delineate, circumscribe, demarcate