From Longman Dictionary of Contemporary Englishsea powerˈsea ˌpower noun 1 [uncountable]PMN the size and strength of a country’s navy2 [countable]PMN a country with a powerful navy
Examples from the Corpus
sea power• In a sea power economy, vested interests are in open markets and free trade.• For Mahan sea power was critical, for Mackinder a particular land mass.• The most difficult strategic question was whether sea power was any longer the foundation upon which the Three Pillars could continue to stand. 