Etymology
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irenic (adj.)

"promoting peace," 1854, from Greek eirēnikos, from eirēnē "peace, time of peace," a word of unknown etymology. Earlier as irenical (1650s). Irenics is from 1834, originally a branch of theology.

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eirenic (adj.)

"tending toward or productive of peace," 1866, from Greek eirēnikos, from eirēnē "peace, time of peace," a word of unknown etymology. Earlier as irenic (1864), irenical (1650s).

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