Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
rē̆trĭbūtĭo, ōnis, f. [retribuo], recompense, repayment, retribution (eccl. Lat.): mali pro bono, Aug. Civ. Dei, 22, 23: vitae aeternae, Tert. Apol. 18: meritorum, Sid. Ep. 4, 11: contumeliae, Lact. 6, 18, 27; Vulg. Psa. 136, 8.