Lewis & Short

ēvŏcātĭo, ōnis, f. [evoco], a calling out, calling forth (very rare).

  1. I. In gen.: inferorum, an evoking, Plin. 30, 1, 2, § 6: deorum ex urbibus obsessis, Macr. S. 3, 9.
  2. II. In partic.
    1. A. A summoning of a debtor, Hirt. B. Alex. 56 fin.
    2. B. A calling out, summoning of soldiers on an occasion of sudden danger, Auct. Her. 3, 2, 3: militiae, Jul. Val. Rer. Gest. Alex. 2, 7; cf. Don. Ter. Eun. 4, 7, 2; Serv. Verg. A. 7, 614.