It's big. With almost two full double-columned pages on aion, I'll control myself and show you just two briefer excerpts from it's section on aionios:
Excerpt 1 -
Excerpt 2 -
Thayer, J. H., D. D. Greek-English Lexicon of the New Testament | Grimm: T. & T. Clark, Edinburgh (4th Ed.), 1901, p. 20-21.