Etymology
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demarcate (v.)

1816, "mark off from adjoining lands or territory," a back-formation from demarcation. Figurative sense of "determine the relative limits of" is by 1858. Related: Demarcated; demarcating. The older verb is demark.

updated on July 16, 2018

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Definitions of demarcate from WordNet

demarcate (v.)
separate clearly, as if by boundaries;
demarcate (v.)
set, mark, or draw the boundaries of something;
Synonyms: delimit / delimitate
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.