com·mem·o·ra·tive 
(kə-mĕmər-ə-tĭv, -ə-rā′-)
(kə-mĕmər-ə-tĭv, -ə-rā′-)adj.
1. Honoring or preserving the memory of another.
2. Produced in limited quantities over a specific period of time to honor a special event or anniversary. Used of coins and postage stamps.
n.
1. Something that honors or preserves the memory of another.
2. A commemorative coin or postage stamp.
com·memo·ra·tive·ly adv.