atrōciter [atrōx], adv., fiercely, cruelly.
atrōx, ōcis, adj., savage, fierce, cruel, horrible.
attentus, adj., attentive.
attonitus [attonō, to thunder at], adj., thunder-struck, awe-struck, overwhelmed.
[Attus, ī], m., Attus Nāvius, an augur who defied Tarquinius Priscus.
auctor, ōris [augeō], m., producer, originator, cause.
auctōritās, ātis [auctor], f., authority, power; influence, weight, dignity.
aucupium, ī [avis + capiō], n., bird-catching, fowling.
audācia, ae [audāx, bold], f., boldness, daring; rashness, presumption.
audeō, ēre, ausus sum, to venture, dare.