commemorative

Etymology

From commemorate + -ive.

adj

1. Serving to commemorate something.
   a commemorative plaque
   The centenary of Britain's most famous train has called for a commemorative and descriptive work and in this 40-page illustrated booklet the author has tried—with some success, to pour a quart into a pint pot. 1962 October, “New Reading on Railways: The Flying Scotsman 1862-1962. By C. Hamilton Ellis. Allen & Unwin. 6s.”, in Modern Railways, unnumbered page

noun

1. An object made to commemorate a person, mark an event, etc.
2. (philately) A postage stamp issued to commemorate, usually a person or event; also commonly applied to thematic (topical) stamp issues.
   beautiful Pictorials, topicals, commemoratives, airmails. Introductory selection 40% discount. Ralph Rice, 15 Longlane, West Hartford 7, Conn. 1956 December, “Classified Advertisements: Stamp collecting”, in Popular Mechanics, volume 106, number 6, page 57