Lewis & Short

ŏpĕrātĭo, ōnis, f. [operor], a working, work, labor, operation (not in Cic. or Cæs.).

  1. I. In gen.: insidiantur aquantibus (apibus) ranae, quae maxima earum est operatio, cum sobolem faciunt, Plin. 11, 18, 19, § 61; 11, 24, 28, § 80; Vitr. 2, 9.
  2. II. In partic.
    1. A. A religious performance, service, or solemnity, a bringing of offerings: operationes denicales, offerings, Fest. s. v. privatae feriae, p. 242 Müll.; Inscr. a. 286, p. Chr. ap. Orell. 2234.
    2. B. In Christian authors, beneficence, charity, Lact. 6, 12; Prud. Psych. 573.