Lewis & Short

extemplō (original uncontracted form extempŭlo, Plaut. Aul. 1, 2, 15; id. Cist. 1, 1, 98; 2, 3, 30; id. Bacch. 4, 9, 44; id. Mil. 2, 5, 51; id. Poen. 1, 1, 55), adv. [from ex and tempulum, dim. of templum, in a moment, an instant; hence, like ex tempore], immediately, straightway, forthwith, quickly, without delay (mostly ante-class. and post-Aug.; in Plaut. more than sixty times; only once in Cic.; not in Caes. or Quint.; syn.: repente, subito, statim, continuo).

  1. I. In gen.: verrunt extemplo placidum mare, Enn. ap. Gell. 2, 26 (Ann. v. 377 ed. Vahl.): extemplo me necato et filiam, id. in Varr. L. L. 7, § 13 Müll.; Trag. v. 234 ed. Vahl.): quin occidisti extemplo? Plaut. Rud. 3, 6, 3: erubescit: quid respondeat nescit: quid fingat extemplo non habet, * Cic. Rosc. Com. 3, 8; alii gerendum (bellum) extemplo, antequam, etc., Liv. 41, 1, 1: haec extemplo in invidiam, mox etiam in perniciem verterunt, id. 39, 48, 1; so with mox and postremo, id. 40, 48, 6: dixit et extemplo sensit, etc., Verg. A. 2, 376 et saep.
  2. II. Esp.
    1. A. Corresp. to the temporal and conditional particles ubi, ut, cum, quando, postquam, si.
      With ubi: eaque extemplo, ubi, etc., Plaut. Curc. 1, 1, 80; so id. Capt. 3, 4, 27; Caecil. ap. Gell. 2, 23, 13.
      With ut: utque impulit (Turnus) arma: Extemplo turbati animi, etc., Verg. A. 8, 3; so Plin. Pan. 55, 9.
      With cum: cum … extemplo, Curt. 4, 16, 8.
      With quando, etc.: adambulabo ad ostium, ut, quando exeat, Extemplo, etc., Plaut. Bacch. 4, 5, 9: postquam introii, extemplo ejus morbum cognovi miser, Ter. Hec. 3, 3, 13.
      With si: si umquam … extemplo, etc., Naev. ap. Gell. 2, 19, 6; so Plaut. Am. 1, 1, 52; id. Rud. 2, 3, 74; id. Truc. 1, 1, 24 al.
    2. B. In Plaut. repeatedly: quom (or quoniam) extemplo = ἐπεὶ τάχιστα, as soon as: aedes quom extemplo sunt paratae … laudant fabrum, Plaut. Most. 1, 2, 18; cf. id. Merc. 2, 2, 24; id. Bacch. 2, 3, 70; id. Ps. 3, 2, 15: quom extemplo ad forum advenero, omnes loquentur, etc., id. Capt. 4, 2, 6; cf. id. Trin. 3, 2, 99.
  3. II. At once, i. e. at first = primum (very rare), Liv. 22, 12, 6 Weissenb. ad loc.; Stat. Ach. 2, 88.
    See Hand, Turs. II. pp. 669- 674.