Webster's English Dictionary

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ocean

ocean \'o--sh*n\ n [ME occean, fr. L oceanus, fr. Gk O-keanos, a river 
   though]t of as encircling the earth, ocean 1: the whole body of salt water 
   that covers nearly three fourths of the sur face of the globe 2: one of the 
   large bodies of water into which the great ocean is divided  3: an 
   unlimited space or quantity