Etymology
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Eire

ultimately from Old Irish Eriu (accusative Eirinn, Erinn). The reconstructed ancestry of this derives it from Old Celtic *Iveriu (accusative *Iverionem, ablative *Iverione), perhaps (Watkins) from PIE *pi-wer- "fertile," literally "fat," from root *peie- "to be fat, swell" (see fat (adj.)).

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Definitions of Eire

Eire (n.)
a republic consisting of 26 of 32 counties comprising the island of Ireland; achieved independence from the United Kingdom in 1921;
Synonyms: Ireland / Republic of Ireland / Irish Republic
From wordnet.princeton.edu