Lewis & Short

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dīlĭgentĭa, ae, f. [diligens], carefulness, attentiveness, earnestness, diligence (freq. and class.; cf.: labor, aerumna, opera, industria, assiduitas, sedulitas, studium, cura).

  1. I. In gen.: reliqua sunt in cura, attentione animi, cogitatione, vigilantia, assiduitate, labore; complectar uno verbo, quo saepe jam usi sumus, diligentia, qua una virtute omnes virtutes reliquae continentur, Cic. de Or. 2, 35, 150 (v. the whole chapter in connection).
          1. (α) With praepp.: pro mea summa in re publica diligentia, Cic. Mur. 40, 86: in controversia, id. Att. 2, 15, 4: in verbis, Quint. 4, 2, 117: diligentia tua in retractandis operibus, Plin. Ep. 9, 35, 2: circa proprietatem, Quint. 8, 3, 87: circa istum lacum, Traj. ap. Plin. Ep. 10, 62: erga pecuniam alienam, Tac. A. 4, 20: diligentiam adhibere ad rem, Cic. Fam. 16, 9, 3: in rem, id. ib. 16, 6, 1; 16, 9, 4; cf. id. ib. 16, 4, 4.
          2. (β) Absol., Plaut. Capt. 1, 2, 6; id. Rud. 3, 5, 40; Ter. Hec. 2, 2, 21; Cic. Planc. 4, 9; id. Att. 2, 15 fin.; id. de Or. 1, 61, 260; id. Rep. 1, 22 fin.; id. Lael. 16, 60 et saep.; Caes. B. G. 1, 40, 4; 3, 20, 1 et saep.: obscura, Ter. And. prol. 21; cf. inanis, Quint. 5, 11, 30: nimium sollicita, id. 3, 11, 22; 12, 1, 6: sinistra, Plin. Ep. 7, 28 fin.
          3. (γ) Rarely with gen.: sacrorum, the care of, etc., Cic. Rep. 2, 14; cf.: dignitatis commoditatisque, id. Off. 1, 39: mandatorum tuorum, id. Top. 1 fin.: tenuis illa divisionis, Quint. 4, 5, 6: nostri, i. e. affection for us, Symm. Ep. 1, 41: Ecclesiae Dei, Vulg. 1 Tim. 3, 5.
  2. II. In partic., carefulness in household affairs, i. e. economy, frugality, Cic. Off. 2, 24 fin.; Auct. Her. 4, 22, 25; Suet. Galb. 12 fin.
    Plur. (very rare): maritorum inefficaces diligentiae, precautions, App. M. 9, p. 224, 17.