Definition of: demarcation

(dē′mär·kā′shən) noun
1. The fixing of boundaries or limits.
2. Limitation; discrimination.
3. The limit or line fixed. Also de′mar·ka′tion.
—Line of Demarcation The line established, chiefly in modern Brazil, by Pope Alexander VI in 1493 to prevent disputes between Spain and Portugal in regard to their discoveries in the New World. [<Sp. demarcación <demarcar <de- down (<L de-) + marcar mark a boundary <Gmc.]