The Collaborative International Dictionary of English v.0.48:

pacific \pa*cif"ic\, a. [L. pacificus: cf. F. pacifique. See
   Pacify.]
   Of or pertaining to peace; of a peaceful character; not
   warlike; not quarrelsome; as, a pacific nature or condition.
   [WordNet sense 3]

   Syn: peaceable.
        [1913 Webster]

   2. Promoting peace; suited to make or restore peace;
      conciliatory; as, pacific words or acts. [WordNet sense 1]

   Syn: irenic.
        [WordNet 1.5]

   3. of or pertaining to the Pacific Ocean; as, Pacific
      islands.
      [WordNet 1.5]

   Pacific Ocean, the ocean between America and Asia, so
      called by Magellan, its first European navigator, on
      account of the exemption from violent tempests which he
      enjoyed while sailing over it; -- called also, simply, the
      Pacific, and, formerly, the South sea.
      [1913 Webster]

   Syn: Peacemaking; appeasing; conciliatory; tranquil; calm;
        quiet; peaceful; reconciling; mild; gentle.
        [1913 Webster]

WordNet (r) 3.0 (2006):

South Sea
    n 1: any sea to the south of the equator (but especially the
         South Pacific)