Source : Webster's Revised Unabridged Dictionary (1913)

Erse \Erse\ ([~e]rs), n. [A modification of Irish, OE. Irishe.]
   A name sometimes given to that dialect of the Celtic which is
   spoken in the Highlands of Scotland; -- called, by the
   Highlanders, {Gaelic}.

Gaelic \Gael"ic\, n. [Gael. Gaelig, G[`a]ilig.]
   The language of the Gaels, esp. of the Highlanders of
   Scotland. It is a branch of the Celtic.

Gaelic \Gael"ic\ (?; 277), a. [Gael. G[`a]idhealach, Gaelach,
   from G[`a]idheal, Gael, a Scotch Highlander.] (Ethnol.)
   Of or pertaining to the Gael, esp. to the Celtic Highlanders
   of Scotland; as, the Gaelic language.

Source : WordNet®

Gaelic
     adj : relating to or characteristic of the Celts [syn: {Celtic}]
     n : any of several related languages of the Celts in Ireland and
         Scotland [syn: {Goidelic}, {Erse}]

Source : Free On-Line Dictionary of Computing

Gaelic
     
        For automated test programs.  Used in military, essentially
        replaced by ATLAS.