† inˈdecimable,a.Obs.rare. [f. in-3 + L. decimā-re to tithe, decimate + -able. Cf.med.L. indecimātus not tithed.] (See quot.) 1642Coke Inst. ii. 490 What things be indecimable by the Law, and ought not to pay tithe.1670in Blount Law Dict.[Hence in later Dicts.]