I. adjective 1. relating to the Baltic Sea or the region surrounding it. 2. denoting or relating to a branch of the Indo-European family of languages consisting of Lithuanian, Latvian, and Old Prussian. II. noun 1. ( the Baltic) — the Baltic Sea or the Baltic States. 2. [ mass noun] — the Baltic languages collectively.
– origin late 16th cent.: from medieval Latin Balticus, from late Latin Balthae ‘dwellers near the Baltic Sea’.