αὖ : again, on the
contrary, on the other hand; temporal, Il. 1.540, Od.
20.88, etc.; oftener denoting sequence or contrast, δ᾽ αὖ, δεύτερον αὗ, νῦν αὖ, etc.;
sometimes correl. to μέν, Λ 109, Od. 4.211, and scarcely stronger than
δέ, Β 493, Il. 11.367.