Etymology
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republican (adj.)

1712, "belonging to a republic, of the nature of a republic, consonant to the principles of a republic," from republic + -an. With capital R-, "of, pertaining to, or favoring one of the various American parties that have been called Republican," by 1806 (the modern GOP dates from 1854). The French republican calendar was in use from Nov. 26, 1793 to Dec. 31, 1805. Earlier adjectives included republical
(1650s), republicarian (1680s).

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Irish (n.)

c. 1200, "the Irish people," from Old English Iras "inhabitant of Ireland." This is from Old Norse irar, which comes ultimately from Old Irish Eriu (accusative Eirinn, Erinn) "Erin." 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.)).

From mid-15c. in reference to the Celtic language spoken in Ireland. Some Middle English forms of the word suggest influence of (or punning on) Old French irais, irois "wrathful, bad-tempered" (literally "ire-ous") and Irais "Irish."

Meaning "temper, passion" is 1834, American English (first attested in writings of Davy Crockett), from the legendary pugnacity of the Irish. Irish-American (n.) is from 1816 (as an adjective from 1820). Wild Irish (late 14c.) originally were those not under English rule; Black Irish in reference to those of Mediterranean appearance is from 1888.

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republican (n.)

"one who favors a republican form of government or republican principles" (or, as Johnson puts it, "One who thinks a commonwealth without monarchy the best government"), 1690s; see republican (adj.).

With capital R-, in reference to a member of a specific U.S. political party (the Anti-Federalists) from 1782, though this was not the ancestor of the modern U.S. Republican Party, which dates from 1854. In between, National Republicans was a name of the party that opposed Jackson and rallied behind John Quincy Adams in late 1820s.

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army (n.)

late 14c., "armed expedition," from Old French armée "armed troop, armed expedition" (14c.), from Medieval Latin armata "armed force," from Latin armata, fem. of armatus "armed, equipped, in arms," as a noun, "armed men, soldiers," past participle of armare "to arm," literally "act of arming," related to arma "tools, arms" (see arm (n.2)).

Originally used of expeditions on sea or land; restriction to "land force" is by late 18c. Transferred meaning "host, multitude" is c. 1500. Meaning "body of men trained and equipped for war" is from 1550s.

The Old English words were here (still preserved in derivatives such as harrier; see harry (v.)), from Proto-Germanic *harjan, from PIE *korio- "people, crowd;" and fierd, with an original sense of "expedition," from Proto-Germanic *farthi-, related to faran "travel" (see fare (v.)). In spite of etymology, in the Anglo-Saxon Chronicle here generally meant "invading Vikings" and fierd was used for the local militias raised to fight them. Army-ant is from 1863.

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Irish (adj.)
c. 1200, Irisce, "of Irish nationality;" see Irish (n.). Irish stew is attested from 1814; Irish lace is from 1851; Irish coffee is from 1950. Meaning "Irish in nature or character," it is attested from 1580s, and until 19c. often meaning "contradictory." In later use often mocking or dismissive, such as Irish apricot "potato," Irish daisy "common dandelion."
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dissident (adj.)

1530s, "different, at variance, disagreeing," from Latin dissidentem (nominative dissidens), present participle of dissidere "to be remote; disagree, be removed from," literally "to sit apart," from dis- "apart" (see dis-) + sedere "to sit," from PIE root *sed- (1) "to sit."

Meaning "dissenting, not conforming" is from 1837, originally in reference to an established church. Meaning "disagreeing in political matters" is by 1943.

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dissident (n.)

"one who differs or dissents from others," 1766, in reference to Protestants and other non-Catholics in Poland, from dissident (adj.). General sense of "an opponent or non-conformist with regard to a prevailing opinion, method, etc." is by 1790, at first especially with reference to religion. In the political sense it is used by 1940, coinciding with the rise of 20c. totalitarian systems, especially with reference to the Soviet Union.

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I.R.A. (1)
also IRA, 1921, initialism (acronym) for Irish Republican Army, the full name of which attested from 1919.
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republicanism (n.)

1680s, "republican principles; a republican form of government," from republican (adj.) + -ism. With capital R-, in reference to the modern U.S. Republican Party by 1856.

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harry (v.)

Old English hergian "make war, lay waste, ravage, plunder," the word used in the Anglo-Saxon Chronicle for what the Vikings did to England, from Proto-Germanic *harjon (source also of Old Frisian urheria "lay waste, ravage, plunder," Old Norse herja "to make a raid, to plunder," Old Saxon and Old High German herion, German verheeren "to destroy, lay waste, devastate"). This is literally "to overrun with an army," from Proto-Germanic *harjan "an armed force" (source also of Old English here, Old Norse herr "crowd, great number; army, troop," Old Saxon and Old Frisian heri, Dutch heir, Old High German har, German Heer, Gothic harjis "a host, army").

The Germanic words come from PIE root *korio- "war" also "war-band, host, army" (source also of Lithuanian karas "war, quarrel," karias "host, army;" Old Church Slavonic kara "strife;" Middle Irish cuire "troop;" Old Persian kara "host, people, army;" Greek koiranos "ruler, leader, commander"). Weakened sense of "worry, goad, harass" is from c. 1400. Related: Harried; harrying.

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