H. P. Grice, "The principle of economy of rational effort"

oecŏnŏmĭcus , a, um, adj., = οἰκονομικός. I. Of or relating to domestic economy; subst.: oecŏnŏmĭcus , i, m., a work of Xenophon on domestic economy. in eo libro, qui Oeconomicus inscribitur, Cic. Off. 2, 24, 87; Gell. 15, 5, 8.— II. Of or belonging to a proper (oratorical) division or arrangement; orderly, methodical: “oeconomica totius causae dispositio,” Quint. 7, 10, 11.