adv. Obs. rare–1. [f. ASCERTAIN a. + -LY2.] Certainly, surely, assuredly.
1475. Caxton, Jason, 12. She was so wreton by loue in his herte so acertainly that he coude neuer kepe him fro thinking on her.
adv. Obs. rare–1. [f. ASCERTAIN a. + -LY2.] Certainly, surely, assuredly.
1475. Caxton, Jason, 12. She was so wreton by loue in his herte so acertainly that he coude neuer kepe him fro thinking on her.
