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thalassocracy

American  
[thal-uh-sok-ruh-see] / ˌθæl əˈsɒk rə si /

noun

plural

thalassocracies
  1. dominion over the seas, as in exploration, trade, or colonization.


thalassocracy British  
/ ˌθæləˈsɒkrəsɪ /

noun

  1. the government of a nation having dominion over large expanses of the seas

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of thalassocracy

First recorded in 1840–50; thalasso- + -cracy