The Collaborative International Dictionary of English v.0.48:

eire \eire\, n.
   Air. [Obs.] --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Eire \Eire\, prop. n.
   the Irish name for Ireland; the name used in 1937 to 1949 for
   the Republic of Ireland.

   Syn: Erin, Ireland. [PJC]

WordNet (r) 3.0 (2006):

Eire
    n 1: a republic consisting of 26 of 32 counties comprising the
         island of Ireland; achieved independence from the United
         Kingdom in 1921 [syn: Ireland, Republic of Ireland,
         Irish Republic, Eire]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

EIRE, or EYRE, English law. A journey. Justices in eyre, were itinerant
judges, who were sent once in seven years with a general commission in
divers counties, to hear and determine such causes as were called pleas of
the crown. Vide Justices in eyre.