placitum est: cf. licitum est, Ep. LXXV.3n. A confusion between the active and passive forms is noticeable in early Latin and in colloquial Latin of all periods; see, e.g., Guericke, de Linguae Vulgaris Reliquiis apud Petronium, etc., 49, and Rnsch, It. u. Vulg. 297 ff. See also the statement with reference to the conservative element in colloquial Latin, Intr. 70. In general, colloquial Latin is distinguished from formal Latin by a less degree of fixity in the matter of form and construction.
legationem liberam: cf. legati, Ep. 1.2 B.
pollicitus est: sc. Hirtius.
insectatio: apparently the first extant instance of the use of the word. Cf. Intr. 75.
dederint: cf. dimisero, Ep. XV.2n.
aqua interdicatur: the technical phrase for banishment.