Actually both spellings are acceptable...as shown here: col·lect·i·ble also col·lect·a·ble (kə-lěk'tə-bəl) Pronunciation Key adj. That can be collected: a collectible loan. Worthy of being collected: collectible antique coins.n. One of a group or class of objects, such as period glass or historical memorabilia, sought by collectors. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2006 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.