Source : Webster's Revised Unabridged Dictionary (1913)

Permissive \Per*mis"sive\, a.
   1. Permitting; granting leave or liberty. ``By his permissive
      will.'' --Milton.

   2. Permitted; tolerated; suffered. --Milton.

Source : WordNet®

permissive
     adj 1: not preventive [ant: {preventive}]
     2: granting or inclined or able to grant permission; not strict
        in discipline; "direct primary legislation is largely
        permissive rather than prescriptive"; "permissive parents"
        [ant: {unpermissive}]