Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ămātĭo, ōnis, f. [amo], love, caressing, fondling (perh. only in Plaut.): tua mihi odiosa est amatio, Plaut. Cas. 2, 5, 20; so id. Poen. 5, 2, 136; id. Rud. 4, 5, 14: neque in hac (fabulā) amatio, intrigue, id. Capt. epil. 2.
In plur., Plaut. Merc. 4, 4, 53.