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of or relating to the .
of, relating to, or situated on the eastern seaboard of the U.S.:
the Atlantic states.
of or relating to the countries bordering the , especially those of North America and Europe.
of or relating to the or its members:
the Atlantic Alliance.
.
Railroads. a steam locomotive having a four-wheeled front truck, four driving wheels, and a two-wheeled rear truck.
Contemporary Examples

“The youngest old man any of us knows,” an unnamed friend of Atlantic Publisher David Bradley said of Hughes.
The Rise and Fall of Chris Hughes and Sean Eldridge, America’s Worst Gay Power Couple James Kirchick December 8, 2014

And a warmer Atlantic Ocean seems to have kept Sandy roaring toward New York and New Jersey.
Hurricane Sandy’s Unmistakable Message Michael Daly November 4, 2012

Her writing has appeared in the Atlantic, Foreign Policy, Newsweek, the New Republic, and Slate, among others.
Meet Radical Islam’s Tech Guru Sarah A. Topol December 25, 2010

Harry will NOT repeat NOT now be spending a few days privately in Atlantic City.
Prince Harry’s U.S. Tour: Rolling Updates and all the News and Pictures as It Happens Tom Sykes May 14, 2013

Over at The Atlantic, Conor Friedersdorf reviewed the case and concluded that everything about it “is insanely newsworthy.”
Why Are the Media Apologizing About Kermit Gosnell Coverage? Josh Dzieza April 12, 2013

Historical Examples

I’ll meet you at the Atlantic House in Chicago on the first.
A Son of the Middle Border Hamlin Garland

The brig sailed, however, and stood across the Atlantic, as if in good earnest.
Ned Myers James Fenimore Cooper

As a natural sequence other Atlantic cables followed in course of time.
The Story of The Atlantic Cable Charles Bright

The purser’s room was well forward on the Atlantic steamship.
In a Steamer Chair and Other Stories Robert Barr

By Thursday they had passed the great depths of the Atlantic, and were off soundings.
The Story of the Atlantic Telegraph Henry M. (Henry Martyn) Field

noun
the Atlantic, short for Atlantic Ocean
adjective
of or relating to or bordering the Atlantic Ocean
of or relating to Atlas or the Atlas Mountains

late 14c., occean of Athlant “sea off the west coast of Africa” (early 15c. as occean Atlantyke), from Latin Atlanticus, from Greek Atlantikos “of Atlas,” adjectival form of Atlas (genitive Atlantos), in reference to Mount Atlas in Mauritania (see Atlas). Applied to the whole ocean since c.1600.