Source : Webster's Revised Unabridged Dictionary (1913)

Collectible \Col*lect"i*ble\, a.
   Capable of being collected.

Source : WordNet®

collectible
     adj : subject to or requiring payment especially as specified; "a
           collectible bill"; "a note payable on demand"; "a check
           payable to John Doe" [syn: {collectable}, {payable}]
     n : things considered to be worth collecting (not necessarily
         valuable or antique) [syn: {collectable}]