Source : Webster's Revised Unabridged Dictionary (1913)

Indecimable \In*dec"i*ma*ble\, a. [Pref. in- not + LL. decimare
   to tithe: cf. F. ind['e]cimable. See {Decimate}.]
   Not decimable, or liable to be decimated; not liable to the
   payment of tithes. --Cowell.