Definition of: Irish

(ī′rish) adjective
Pertaining to Ireland, its people, or their language.
—noun
1. The people of Ireland collectively: with the.
2. The ancient or modern language of Ireland, belonging to the Goidelic branch of the Celtic languages; Irish Gaelic: sometimes called Erse. Historically, the language is divided into Old Irish, from approximately 700 to 1100; Middle Irish, from 1100 to 1600; and Modern Irish, after 1600.
3. The dialect of English spoken in Ireland; Irish English.
4. Colloq. Temper: He got his Irish up. [ME Irisc, OE Īras <ON Īrar the Irish <OIrish Ēriu Ireland. Cf. EIRE.]