Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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I.R.A. abbreviation of "Irish Republican Army."
R and B abbreviation of "rhythm and blues."
R and D abbreviation of "research and development."
R and R abbreviation of "rest and recuperation." [2 definitions]
R.I.P. abbreviation of "requiescat in pace" (Latin); may he, or she, rest in peace.
R.S.V.P. abbreviation of "répondez s'il vous plaît" (French); please reply.
RI abbreviation of "Rhode Island," a New England state on the Atlantic coast between Connecticut and Massachusetts.
U.S.S.R. abbreviation of "Union of Soviet Socialist Republics," formerly, a country, comprising fifteen constituent republics, in eastern Europe and northern Asia; Soviet Union.