TITHE Copy link • TITHE 1. s. decuma: decuma or decima pars. To pay tithes, decumam, decumas pendere, solvere: a tithe of the produce, decumanum frumentum (Cic.): land subject to tithes, decumanus ager (Cic.). 2. v. decumas imperare, imponere (to levy taxes): decimare (to decimate, to take by lot every tenth man for punishment).