Lewis & Short

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inter-vĕnĭo, vēni, ventum, 4, v. n., rarely a., to come between, come upon, to come in during, to intervene, interrupt (class.; syn. intercedo).

  1. I. Lit., constr. with dat., rarely with acc.
    1. A. Of persons: sponsae pater intervenit, Ter. And. 4, 3, 17: quin malo abscedas: ne interveneris, quaeso, dum resipiscit, Plaut. Mil. 4, 8, 23: verens ne molesti vobis interveniremus, Cic. de Or. 2, 3: casu Germani equites interveniunt, Caes. B. G. 6, 37: orationi, Liv. 1, 48: Statius intervenit nonnullorum querelis, Cic. Q. Fr. 1, 2, 1.
      With pro: pro sociis, Flor. 1, 13, 6.
      With ne: ne quid perperam fieret, Suet. Tib. 33.
    2. B. Of things.
      1. 1. To come, be, or lie between: medius paries intervenit, Dig. 33, 3, 4: interveniente Ascanio lacu, Plin. 5, 32, 43, § 148: interveniente flumine, id. 5, 1, 1, § 13; 4, 21, 35, § 115.
      2. 2. To interfere with, interrupt, put a stop to.
          1. (α) With dat.: nox proelio intervenit, Liv. 23, 18: continuationi sermonis, Quint. 9, 3, 23: verboque intervenit omni plangor, Ov. M. 11, 708; so, of an oath in conversation: quoties lascivum intervenit illud, etc., Juv. 6, 194.
          2. (β) With acc. (only in Tacitus): ludorum diebus, qui cognitionem intervenerant, Tac. A. 3, 23.
  2. II. Transf.
    1. A. To take place meanwhile or among other things, to happen, occur: nulla mihi res posthac potest jam intervenire tanta, quae, etc., Ter. Heaut. 4, 3, 1: quae inter vos intervenerint, etc., id. Hec. 3, 2, 16: Epicurus exiguam dicit fortunam intervenire sapienti, Cic. Fin. 1, 19: casus mirificus quidam intervenit, has taken place, id. Fam. 7, 5, 2: interveniunt motu stellarum grandines, imbres, Plin. 18, 25, 57, § 208: intervenit his cogitationibus avitum malum, regni cupido, Liv. 1, 6.
    2. B. To stand in the way of, to oppose, hinder, prevent, disturb: Sabinum bellum coeptis intervenit, Liv. 1, 36: deliberationi metum pro republica intervenisse, id. 2, 24: vilicum intervenientem flagellāsset, Suet. Claud. 38: quis vestro Deus intervenit amori? Calp. Ecl. 3, 23.
    3. C. Leg. t. t.
      1. 1. To interpose, become surety, Dig. 15, 1, 3, § 5; 50, 1, 17, § 15 al.
      2. 2. To conduct a suit in another’s name, Gai. Inst. 4, 87; cf. 4, 86 init.: pro debitore, id. ib. 4, 182.
    4. D. To interfere, intermeddle, exercise one’s authority: neque senatu interveniente, Suet. Caes. 30: praetor interveniet, Dig. 4, 3, 23.
      Pass. impers.: si interventum est casu, Cic. Top. 20: ubi de improviso est interventum mulieri, Ter. Heaut. 2, 3, 40.

inter-vēnĭum, ĭi, n. [vena], the space between the veins, in the earth, in stones, etc., Vitr. 2, 6; 8, 1.