Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
invītātĭo, ōnis, f. [invito], an invitation, incitement, challenge (class.): aderat et hospitum invitatio liberalis, Cic. Phil. 9, 3, 6: in Epirum invitatio quam suavis! id. Att. 9, 12, 1: quaedam ad dolendum, id. Tusc. 3, 34, 82: fit invitatio, ut, etc., id. Verr. 2, 1, 26, § 66.
With gen.: largior vini, Gell. 15, 2, 4; cf. benigna, feast, revel, banquet, Liv. 40, 7.