The Collaborative International Dictionary of English v.0.48:

Legible \Leg"i*ble\ (l[e^]j"[i^]*b'l), a. [L. legibilis, fr.
   legere to read: cf. OF. legible. See Legend.]
   1. Capable of being read or deciphered; distinct to the eye;
      plain; -- used of writing or printing; as, a fair, legible
      manuscript.
      [1913 Webster]

            The stone with moss and lichens so overspread,
            Nothing is legible but the name alone. --Longfellow.
      [1913 Webster]

   2. Capable of being discovered or understood by apparent
      marks or indications; as, the thoughts of men are often
      legible in their countenances.
      [1913 Webster]

WordNet (r) 3.0 (2006):

legible
    adj 1: (of handwriting, print, etc.) capable of being read or
           deciphered; "legible handwriting" [ant: illegible]