Lewis & Short

ămĭta, ae, f. [cf. abba, avus, and Engl. aunt] (so the mother’s sister is called matertera, from mater; cf. Dig. 38, 10, 10),

  1. I. a father’s sister, a paternal aunt, Cic. Clu. 10; Liv. 39, 11; Tac. A. 12, 64; 27, 16; Vulg. Lev. 20, 19 et saep.
  2. II. Hence,
    1. A. Amita magna, a sister of a grandfather (avi), a great-aunt, Tac. A. 2, 27; Paul. l. c.
    2. B. Amita major, an aunt of a grandfather, Paul. l. c. and Fest. s. v. Major, p. 98.
    3. C. Amita maxima, an aunt of a great-grandfather, also called abamita, Paul. l. c. and Fest. s. v. Major, p. 98.