portal

An entrance, entry point, or means of entry.

The local library, a portal of knowledge.

Last, but very much not least, are the portals of the Ffestiniog Railway's Moelwyn Tunnel. The tunnel's story itself is well told - it was part of the preservationists' deviation required to get around a reservoir that had flooded the earlier route. But the reason for its inclusion here is that it is probably the most recently constructed, properly architected tunnel portal in Britain.

An entrance, entry point, or means of entry.

A website or page that acts as an entrance to other websites or pages on the Internet.

The new medical portal has dozens of topical categories containing links to hundreds of sites.

A website or page that acts as an entrance to other websites or pages on the Internet.

I have already inputted my info on the portal.

A website or page that acts as an entrance to other websites or pages on the Internet.

You need to have a portal to have a driver's license.

Of or relating to a porta, especially the porta of the liver.

the portal vein

To use a portal (magical or technological doorway).