2 definitions found From WordNet (r) 2.0 [wn]: aeonian adjective 1: of or relating to a geological eon (longer than an era) [syn: {eonian}] 2: lasting for an indefinitely long period of time [syn: {everlasting}, {eternal}, {lasting}, {eonian}] From The Collaborative International Dictionary of English v.0.44 [gcide]: aeonian \aeonian\, AEonian \[AE]*o"ni*an\, adjective [Gr. ?.] Eternal; everlasting; lasting for an indefinitely long time; immortal; not subject to death. Opposite of {mortal}. ''[AE]onian hills.'' --Tennyson. Syn: eonian [1913 Webster + WordNet 1.5] 2. of or pertaining to an eon. [WordNet 1.5]

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