Lewis & Short

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mātūtīnus, a, um, adj. [Matuta; cf.: mane, manus, maturus],

  1. I. of or belonging to the morning, morning- (class.): tempora, the morning hours, Cic. Fam. 7, 1, 1: frigora, Hor. S. 2, 6, 45: dies, the morning, Col. 6, 2, 3: equi, i. e. Aurorae, Ov. F. 5, 160: radii, the morning sun, id. M. 1, 62: somni, Mart. 14, 125, 1: harena, i. e. the morning-hunt in the Circus, Ov. M. 11, 26: cliens, who comes early in the morning, Mart. 12, 68, 1: Juppiter, who is saluted early in the morning, id. 4, 8, 12: Aeneas se matutinus agebat, was up early, Verg. A. 8, 465: pater, i. e. Janus, who (as the god of time) was invoked early in the morning, that he might promote business, Hor. S. 2, 6, 20: ter matutino Tiberi mergetur, Juv. 6, 523: matutino sudans amomo, id. 4, 108.
  2. II. Transf.: frons, i. e. sober, serious, Mart. 13, 2, 10.
    Subst.: mātūtīnum, i, n., the morning, morning-, Plin. 20, 9, 33, § 80: serere matutinis, meridie metere, id. 4, 12, 26, § 90.
    Hence, adv., in two forms.
    1. A. mātūtī-nē, in the morning, early in the morning, only ap. Prisc. p. 635 P.
    2. B. mātūtīnō, early in the morning (post-Aug.), Plin. 7, 53, 54, § 181; 19, 12, 60, § 183; App. M. 5, 17, p. 166; 7, 24, p. 198 al.; cf. Charis. 168 P.; Diom. 402 P.