Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
multātĭo (mulct-), ōnis, f. [2. multo], a penalty, amercement, fine in any thing (class.): misera est multatio bonorum, Cic. Rab. Perd. 5, 16: multatio non nisi ovium boumque impendio dicebatur, Plin. 18, 3, 3, § 11: AEDILIS MVLTATIO, Inscr. Orell. 2488.