testimonial

Short definition from Wiktionary

Noun

1. 1
   A statement, especially one given under oath; testimony
2. 2
   A written recommendation of someone's worth or character
3. 3
   A tribute given in appreciation of someone's service etc.
4. 4
   A match played in tribute to a particular player (who sometimes receives a proportion of the gate money).

Adjective

1. 1
   Serving as testimony.