Insinuatio, onis, f. g. Verbale. Cic A colourable or crafty beginning of an oration, whereby we couertly creepe into the fauour of the audience.
Lewis and Short: Latin dictionary
insĭnŭātĭo, ōnis, f. [insinuo], an entrance through a narrow or crooked way.I.Lit.: Ponti, Avien. Perieg. 397.—II.Trop.A.An insinuating or ingratiating one's self into the favor of others: exordium in duas partes dividitur, in principium et insinuationem.... Insinuatio est oratio, quadam dissimulatione et circuitione obscure subiens auditoris animum, Cic. Inv. 1, 15, 20.—B.A notification, publication, Cod. Just. 8, 54, 32.