a written declaration certifying to a person's character, conduct, or qualifications, or to the value, excellence, etc., of a thing; a letter or written statement of recommendation.
2.
something given or done as an expression of esteem, admiration, or gratitude.
–adjective
3.
pertaining to or serving as a testimonial: a testimonial dinner for the retiring dean.
Origin: 1375–1425; late ME < LL testimōniālis.See testimony, -al1