Atlantic

UK: /ətˈlæntɪk/ US: (at lan′tik)

WordReference Random House Unabridged Dictionary of American English © 2025

At•lan•tic  (at lan′tik), adj. 

1. Place Names of or pertaining to the Atlantic Ocean.
2. Place Names of, pertaining to, or situated on the eastern seaboard of the U.S.:
   the Atlantic states.
3. Place Names of or pertaining to the countries bordering the Atlantic Ocean, esp. those of North America and Europe.
4. Government of or pertaining to the North Atlantic Treaty Organization or its members:
   the Atlantic Alliance.

n. 

5. Place Names See Atlantic Ocean. 
6. Rail Transport a steam locomotive having a four-wheeled front truck, four driving wheels, and a two-wheeled rear truck. See table under Whyte classification. 

• Greek Atlantikós of (Mount) Atlas, equivalent. to Atlant- (stem of Átlās) + -ikos -ic
• Latin Atlanticum (mare) the Atlantic (ocean), neuter of Atlanticus
• Middle English 1350–1400

Collins Concise English Dictionary © HarperCollins Publishers::

Atlantic / ətˈlæntɪk/ noun

1. the Atlantic ⇒
   short for Atlantic Ocean

adjective

1. of or relating to or bordering the Atlantic Ocean
2. of or relating to Atlas or the Atlas Mountains

Etymology: 15th Century: from Latin Atlanticus, from Greek (pelagos) Atlantikos (the sea) of Atlas (so called because it lay beyond the Atlas Mountains)