Anitem of an account (for the class. aera, plur. of aes, Ruf. Fest. in Breviar. init. The passage of Lucil. cited by Non. 2, 42, aera perversa, is also prob. plur.).
An era or epoch from which time is reckoned, Isid. Orig. 5, 36; cf. Inscr. Orell. II. p. 374.