Source : Webster's Revised Unabridged Dictionary (1913)

Primeval \Pri*me"val\, a. [L. primaevus; primus first + aevum
   age. See {Prime}, a., and {Age}.]
   Belonging to the first ages; pristine; original; primitive;
   primary; as, the primeval innocence of man. ``This is the
   forest primeval.'' --Longfellow.

         From chaos, and primeval darkness, came Light. --Keats.

Source : WordNet®

primeval
     adj : having existed from the beginning; in an earliest or
           original stage or state; "aboriginal forests"; "primal
           eras before the appearance of life on earth"; "the
           forest primeval"; "primordial matter"; "primordial
           forms of life" [syn: {aboriginal}, {primal}, {primaeval},
            {primordial}]