Dictionary![]() ![]() IR1. infrared. 2. intelligence ratio. 3. information retrieval. IrIrish (def. 4). Ir—Symbol, Chem. iridium. ir-var. of in- 2 (by assimilation) before r: irradiate. ir-var. of in- 3 (by assimilation) before r: irreducible. Ir.1. Ireland. 2. Irish. I.R.1. immediate reserve. 2. infantry reserve. 3. intelligence ratio. 4. internal revenue. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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