Etymology
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portal (n.)

late 14c., "gate, gateway," especially "the entire architectural treatment of the entrance and its surroundings of a cathedral or other grand building," from Old French portal "gate" (Modern French portail) and directly from Medieval Latin portale "city gate, porch," from neuter of portalis (adj.) "of a gate," from Latin porta "gate," from PIE *prta-, suffixed form of PIE root *per- (2) "to lead, pass over." The medical sense of "place where a drug, etc., enters or leaves the system" is by 1910.

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Definitions of portal

portal (n.)
a grand and imposing entrance (often extended metaphorically);
the portals of success
the portals of heaven
the portals of the cathedral
portal (n.)
a site that the owner positions as an entrance to other sites on the internet;
a portal typically has search engines and free email and chat rooms etc.
Synonyms: portal site
portal (n.)
a short vein that carries blood into the liver;
Synonyms: portal vein / hepatic portal vein / vena portae
From wordnet.princeton.edu