Lewis & Short

māne, indecl. (archaic abl. mani, like luci, vesperi: a mani ad vesperum, Plaut. Most. 3, 2, 80; id. Poen. 3, 3, 37), n. [old Lat. manus, good; whence immanis; cf. Manes].

  1. I. The morning, morn. As subst., mostly poet. and in post-Aug. prose: noctes vigilabat ad ipsum Mane, Hor. S. 1, 3, 18: a primo mane opus aggredi, at the earliest dawn, Col. 11, 1, 14: mane novum, Verg. G. 3, 325: (litteras) multo mane mihi dedit, very early in the morning, Cic. Att. 5, 4, 1: mane totum dormies, Mart. 1, 49, 36: mane erat, Ov. F. 1, 547: a mane usque ad vesperam, Suet. Calig. 18: a mane diei, Auct. B. Afr. 42.
  2. II. As adv., in the morning, early in the morning (freq. and class.): postridie ejus diei, mane, Caes. B. G. 4, 13; 5, 10, 1: hodie mane, this morning, Cic. Att. 13, 9, 1: cras mane, to-morrow morning, Ter. Phorm. 3, 2, 46: hodierno die, mane, Cic. Cat. 3, 9, 21.
    Connected with other adverbs: nimis paene mane est, Plaut. Pers. 1, 3, 33: bene mane, very early in the morning, Cic. Att. 4, 9, 2; 14, 18, 1; 10, 16, 1: primo mane, Just. 1, 10; Col. 12, 1, 3: tam mane, Ter. Heaut. 1, 1, 15: plane mane, quite early in the morning, Plin. Ep. 1, 5, 8.