Indispensable
Pronunciation : In`dis*pen"sa*ble
Part of Speech : a.
Etymology : [Pref. in- not + dispensable: cf. F. indispensable.]
Definition : 1. Not dispensable; impossible to be omitted, remitted, or spared; absolutely necessary or requisite.
2. (Eccl.)
Defn: Not admitting dispensation; not subject to release or exemption. [R.] The law was moral and indispensable. Bp. Burnet.
3. Unavoidable; inevitable. [Obs.] Fuller.
Source : Webster's Unabridged Dictionary, 1913