Lewis & Short

disjunctĭo or dījunctio, ōnis, f. [disjungo], a separation (a Ciceron. word).

  1. I. In gen.: in tanta disjunctione meorum, tanta acerbitate, Cic. Sest. 21, 47; cf. (amicorum), with alienatio, id. Lael. 21: animorum disjunctio dissensionem facit, i. e. the diversity, difference, id. Agr. 2, 6, 14; cf. sententiae, id. Prov. Cons. 17, 40.
  2. II. In partic.
    1. A. In philos. lang., an opposition of two propositions disjunctively connected in a syllogism, Cic. N. D. 1, 25, 70; id. Top. 14, 56; id. Ac. 2, 30, 97; id. Fat. 16, 37; cf. disjunctus.
    2. B. In rhet., a fig. of speech.
      1. 1. Corresp. to the Gr. διεζευγμένον, Cic. de Or. 3, 54, 207 (quoted in Quint. 9, 1, 35); Auct. Her. 4, 27; Gell. 2, 7 fin.
      2. 2. Corresp. to the Gr. συνωνυμία, i. e. the use of different words or phrases having the same import, Quint. 9, 3, 45.