Definitions for "Commemorative"
something that commemorates, especially a postage stamp or coin having a design commemorating some event, person, institution, etc.
A stamp issued for a limited time and limited quantity to honor a certain person, event, anniversary or group.
a coin honoring an event, place or individual, usually of limited mintage
Keywords:  plaque, intended, tending
Tending or intended to commemorate; as, a commemorative plaque.
intended as a commemoration; "a commemorative plaque"