testimonial Definition

1. A letter or certificate giving details of one's character, conduct and qualifications.

Thesaurus: commendation, recommendation, endorsement, plug (slang).
2. A gift presented (often in public) as a sign of respect or as a tribute to personal qualities or services.

Thesaurus: tribute, memorial, commemoration.
3. football.
A match or series of matches held in honour of a player, usually towards the end of their playing career, with the proceeds being presented to them.