Source : Webster's Revised Unabridged Dictionary (1913)

Readable \Read"a*ble\, a.
   Such as can be read; legible; fit or suitable to be read;
   worth reading; interesting. -- {Read"a*ble*ness}, n. --
   {Read"a*bly}, adv,.

Source : WordNet®

readable
     adj : easily deciphered [syn: {clear}, {decipherable}]